题目内容
5.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 |
分析 句意:你难以完成那道练习题,不可能是词汇量的原因,因为你掌握了大量的词汇.
解答 答案B.根据原因状语从句 because you know a lot of words可知,主句应该是否定的,A项和C项可排除.needn't表示"不必".此处为对可能性的推测,couldn't表示"不可能".根据句意可知,B项符合语境,故选B.
点评 本题考查情态动词.解答此类题目关键是要读懂句意,并且对每个情态动词的基本用法和特殊用法都要熟知,然后根据语境辨析锁定答案.
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