Boundaries: Punctuation and Sentence Structure

SAT Reading and Writing· difficulty 2/5

The early astronomers had no telescopes ______ they still managed to map the visible planets and stars with surprising accuracy.

Which choice completes the text so that it conforms to the conventions of Standard English?

Explanation

Comma plus FANBOYS ("yet") joins two independent clauses. " yet" is a run-on; ", yet," adds an extra comma; ": yet" misuses the colon.

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