2. 外语
  3. —"Why are you so sure that Ann didn’t commit the crime she’s been accused of committing?" —"She mustn’t have committed that crim

—"Why are you so sure that Ann didn’t commit the crime she’s been accused of committing?" —"She mustn’t have committed that crim

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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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