◎ 题干
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
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words. (2013·安徽,34)A.mayB.couldn’tC.shouldD.needn’t…”主要考查了你对  【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。