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    精英家教网 > 高中英语 > 题目详情
    (2013·安徽高考)It ________ be the vocabulary that caused you the problem in the exercise because you know a lot of words.
    A．mayB．couldn't
    C．shouldD．needn't
    B
    选B　考查情态动词的用法。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。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”，不符合题意。此处表示可能性，故选B。
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