A. shouldn't
B. couldn't
C. wouldn't
D. mightn't
答案 __C__ 知识点 ____
解析 句意:不管她怎么用力推门,都无法打开这扇门。shouldn't“不应该”; couldn't“主观的不能”; wouldn't“不会;不能(客观)”; mightn't“可能不”。
2.(2017·新课标卷Ⅱ)Since nobody gave him any help, he ________ have done the research on his own.
A. can B. must
C. would
D. need
答案 __B__ 知识点 ____
解析 句意:由于没人给予他任何帮助,他一定是独立做的研究。must have done对过去的肯定推测。
3.(2017·北京卷)— You needn't take an umbrella. It isn't going to rain.
— Well, I don't know. It ________ do.
A. might
B. need
C. would
D. should
答案 __A__ 知识点 ____
解析 句意:——你不必带伞,天不会下雨。——哦,我不知道。天也许会下雨。might“也许”,表推测,符合句意。
4.(2017·安徽卷)It ________ be the vocabulary that caused you the problem in the exercise because you know a lot of words.
A. may
B. couldn't
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