Question 141·200 Super-Hard SAT Reading Questions·Standard English Conventions
Renowned marine biologist Sylvia ______ decades cataloging deep-sea coral species, has inspired a new generation of scientists to protect fragile ocean ecosystems.
Which choice completes the text so that it conforms to the conventions of Standard English?
For sentence-structure questions with a blank inside a longer sentence, first strip the sentence down to its core: identify the subject and the main verb that must go together. Then use the commas and other punctuation to decide whether the missing words should be part of the main clause or an extra modifier. Quickly eliminate any choice that (1) puts a comma between the subject and its verb, (2) creates two full clauses or verb phrases separated only by a comma, or (3) leaves the core sentence incomplete when you remove the modifier. Finally, read the remaining option in context to confirm it sounds natural and grammatical.
Hints
Identify the main clause
Ignore the blank and the phrase about cataloging for a moment. What is Sylvia doing in the main action of the sentence?
Pay attention to the commas
There will be a comma before the added words (after "Earle" in some options) and another comma before "has inspired." What kind of phrase usually appears between two commas like that?
Avoid common punctuation errors
Check for two specific problems: a comma directly between a subject and its main verb, and two full verb phrases separated only by a comma without a conjunction like "and." Which options create these errors?
Test by removing the middle phrase
For each option, imagine removing the words between the commas. Which choice leaves a smooth, grammatically complete sentence?
Step-by-step Explanation
Find the main sentence core
Ignore the blank for a moment and look at the structure of the sentence:
"Renowned marine biologist Sylvia ______ decades cataloging deep-sea coral species, has inspired a new generation of scientists to protect fragile ocean ecosystems."
We know the main idea is that Sylvia has inspired a new generation. So the core needs to read something like:
- "Renowned marine biologist Sylvia Earle … has inspired a new generation of scientists …"
Everything else in the sentence should be extra information that can be added or removed without breaking the main clause.
Use the commas to see what must be a modifier
Notice there will be a comma before the blanked section (after "Earle" in some choices) and another comma is already written before "has inspired."
That means the words we insert likely form a modifier (extra descriptive phrase) between two commas. If we remove that phrase, the sentence still needs to be complete:
- "Renowned marine biologist Sylvia Earle has inspired a new generation of scientists to protect fragile ocean ecosystems."
So the phrase between the commas must:
- Describe Sylvia Earle
- Not act as the main verb for the sentence (because "has inspired" already does that)
- Fit smoothly between commas as extra information
Check each option against the sentence structure
Plug each option in and think about sentence structure and commas.
A) "Earle has spent" → This makes the core "Sylvia Earle has spent decades cataloging deep-sea coral species, has inspired a new generation…" Now "has spent" and "has inspired" are two main verbs joined only by a comma, which is a comma splice.
B) "Earle spending" → "Sylvia Earle spending decades cataloging deep-sea coral species, has inspired…" Here, "spending" is not a properly formed main verb and the structure is awkward; the sentence lacks a clear, correct main clause until "has inspired," and the phrase with "spending" does not work well as a modifier set off by commas.
C) "Earle, has spent" → "Sylvia Earle, has spent decades cataloging deep-sea coral species, has inspired…" This wrongly puts a comma between the subject (Sylvia Earle) and its verb (has spent), and still creates two main verbs with only commas between them.
The remaining option must give us a modifier between commas and one clear main verb phrase: "has inspired."
Confirm the correct structure
Try D) in the sentence:
"Renowned marine biologist Sylvia Earle, having spent decades cataloging deep-sea coral species, has inspired a new generation of scientists to protect fragile ocean ecosystems."
Now the main clause is complete and correctly punctuated: "Renowned marine biologist Sylvia Earle … has inspired a new generation of scientists …" and the phrase "having spent decades cataloging deep-sea coral species" is a participial modifier set off by commas, giving extra information about Sylvia. This matches standard English conventions, so the correct answer is D) Earle, having spent.