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【题目】It ________ be the vocabulary that caused you the problem in the exercise because you know a lot of words.

A.may B.couldn't

C.should D.needn't

【答案】B

【解析】

试题分析:考查情态动词表推测的用法。由语境“因为你知道很多词汇”可知,“你练习中的问题不可能是词汇量不够造成的”,故用couldn't表示否定推测,意思是“不可能”。

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