SAT Reading & Writing · Boundaries
The archive's climate-control system ______ installed only after a flood damaged several rare manuscripts ______ now keeps humidity within…
The archive's climate-control system ______ installed only after a flood damaged several rare manuscripts ______ now keeps humidity within a narrow, carefully monitored range.
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: , ... ,
"Installed only after a flood damaged several rare manuscripts" is a supplement sitting between the subject "the archive's climate-control system" and the main verb "now keeps," adding background about why the system exists without being essential to the sentence's core claim. A mid-sentence supplement needs a comma at both the start and the end. A supplies both. B supplies neither. C and D each supply only one of the two required commas, leaving the boundary incomplete on one side.
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