It??????????bethevocabularythatcausedyoutheproblemintheexercisebecauseyouknowalotofwords.A.may?????????????B.couldn’t?????????????C.should?????????????D.needn’t

Question

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

B

分 析：
A、可以；可能；B、不会，不可能；C、应该；D、不必。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。这里的could用于否定句表示否定推测“不可能“，结合语境可知选B。
考点：
考查情态动词