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

解析题型：语法题。情态动词+have done用来表示对过去事实的推测，may与must在肯定程度有很大的区别，must表示的是一种绝对语气。

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