题目内容

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
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。
【考点定位】情态动词
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