It             be the vocabulary that caused you the problem in the exercise because you know a lot of words.

A．mayB．couldn’tC．shouldD．needn’t

B

解析試題分析：考查情態(tài)動詞。A也許；B不可能；C應(yīng)當(dāng)；D不需要。couldn’t 是非�？隙ǖ耐茰y。句意：因?yàn)槟阋呀?jīng)掌握了很多單詞，所以，引起你練習(xí)中出現(xiàn)問題的因素不可能是詞匯。故B正確。
考點(diǎn)：情態(tài)動詞

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