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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

解析试题分析:考查情态动词。A也许;B不可能;C应当;D不需要。couldn’t 是非常肯定的推测。句意:因为你已经掌握了很多单词,所以,引起你练习中出现问题的因素不可能是词汇。故B正确。
考点:情态动词

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