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 

B

解析試題分析：句意：因?yàn)槟阒篮芏鄦卧~，不可能是詞匯量導(dǎo)致你練習(xí)中的問題。從because you know a lot of words.可知是用couldn’t，表示否定的推測(cè)“不可能”，may“可能，可以”，should“應(yīng)該”，need’t “不必”，都不符合句意。選B。
考點(diǎn)：考查情態(tài)動(dòng)詞

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