You______have been more careful!

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问题 You______have been more careful!

选项 A、must
B、could
C、would
D、need

答案B

解析情态动词题。could have done可以表示某事可能发生但却没有发生，也可以表示对别人的抱怨或指责；must have done表示对过去情况肯定的推测，意为“一定，肯定”；would havedone表示对事情发生或结果的推测，意为“会……”；need have done通常以否定形式出现，即needn’t have done，表示“本来不必做某事”，但实际上做了。根据句意应选[B]。

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专业英语四级

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