He ______ unwisely, but he was at least trying to do something helpful.

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问题 He ______ unwisely, but he was at least trying to do something helpful.

选项 A、may have acted
B、must have acted
C、should act
D、would act

答案A

解析情态助动词+have done用来表示对过去事实的推测，may与must在肯定程度上有很大的区别。

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专业英语四级

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