Boundaries: Punctuation and Sentence Structure

SAT Reading and Writing· difficulty 3/5

The first batch of vaccine doses arrived overnight ______ and clinics across the region opened additional appointment slots within hours.

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

  • A

    ;

  • B

    :

  • C

    (empty)

  • D

    ,

    check_circle

Explanation

Two independent clauses joined by "and" require a comma before the conjunction.

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