SAT Reading & Writing · Boundaries
The bridge's original engineer ______ largely forgotten by history until a researcher rediscovered his detailed personal notebooks ______…
The bridge's original engineer ______ largely forgotten by history until a researcher rediscovered his detailed personal notebooks ______ is now credited with innovations that were decades ahead of his time.
Which choice completes the text so that it conforms to the conventions of Standard English?
Which choice completes the text so that it conforms to the conventions of Standard English?
Answer and explanation
Answer: A: , ... ,
"Largely forgotten by history until a researcher rediscovered his detailed personal notebooks" is a supplement sitting between the subject "the bridge's original engineer" and the main verb "is now credited," adding narrative background without being essential to the sentence's core claim. A mid-sentence supplement needs a comma at both the start and end. A supplies both. B supplies neither. C and D each supply only one of the two required commas, leaving the boundary incomplete.
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