Question

【题目】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

Answer 1

【答案】B
【解析】句意：不可能是词汇导致你在考试中出这个问题，因为你知道很多单词。A、may“可以；可能”；B、couldn't“不会，不可能”；C、should“应该”；D、needn't“不必”。结合语境可知选B。