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It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words.                                                  (2013·安徽,34)
A.may B.couldn’t
C.shouldD.needn’t
B
解析 考查情态动词。句意为:因为你掌握了大量的单词,所以使你在练习中产生问题的原因不可能是词汇问题。couldn’t 不可能。
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