To ensure that the work is completed ______the deadline, I recommend hiring a part-time assistant for Ms. Marshall.

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问题 To ensure that the work is completed ______the deadline, I recommend hiring a part-time assistant for Ms. Marshall.

选项 A、by
B、of
C、in
D、over

答案A

解析 句子的意思是说事情需要在“截止日期”之前完成。(A)选项的“by”可以表达“到……为止”的含义,可以表达某件事情具体的截止日期。
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