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It __be the vocabulary that caused you the problem in the exercise because you know a lot of words.
A.mayB.couldn’tC.shouldD.needn’t
B

试题分析:考查情态动词:A、可以;可能;B、不会,不可能;C、应该;D、不必。句意:不可能是词汇导致你在考试中出这个问题,因为你知道很多单词。结合语境可知选B。
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