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：考查情態(tài)動詞：A、可以；可能；B、不會，不可能；C、應(yīng)該；D、不必。句意：不可能是詞匯導(dǎo)致你在考試中出這個問題，因為你知道很多單詞。結(jié)合語境可知選B。
考點(diǎn)：考查情態(tài)動詞

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