—"Why are you so sure that Ann didn’t commit the crime she’s been accused of com

游客2023-12-30  17

问题 —"Why are you so sure that Ann didn’t commit the crime she’s been accused of committing?"
—"She mustn’t have committed that crime because I was with her, and we were out of town on that day."

选项 A、may not have committed
B、wasn’t supposed to commit
C、might not have committed
D、couldn’t have committed

答案 D

解析 这段话的意思是:“你为什么如此确定Ann没有犯她被控诉的那宗罪?”“她不可能犯罪,因为那天她跟我在一起,我们一块出城了。”此题考查情态动词的用法。题干中用了mustn’t have done的形式,这种形式不存在。must have done表示对过去某事的肯定猜测,过去肯定做了某事,其否定或疑问形式须用can(could)来表示。may/might not have done表示对过去事实的不确定推测,表示“可能不会”,根据后文内容可知此句为肯定的否定推测,所以排除A、C项;选项B表示“不应该”;couldn’t have done表示对过去所发生事情的否定推测,表示“过去不可能做了某事”。答案为D。
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