SAT Reading & Writing · Boundaries
The observatory's newest telescope ______ built with funding from three separate international partners ______ will begin its first…
The observatory's newest telescope ______ built with funding from three separate international partners ______ will begin its first observations next spring.
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: , ... ,
"Built with funding from three separate international partners" is a supplement sitting between the subject "the observatory's newest telescope" and the main verb "will begin," adding background information 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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