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    精英家教网 > 高中英语 > 题目详情
    (2013·高考安徽卷)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。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”。此处为对可能性的推测，couldn’t表示“不可能”。
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