【題目】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】B

【解析】

試題分析：考查情態(tài)動詞表推測的用法。由語境“因?yàn)槟阒篮芏嘣~匯”可知，“你練習(xí)中的問題不可能是詞匯量不夠造成的”，故用couldn't表示否定推測，意思是“不可能”。

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