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 情态动 + 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。
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