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

解析情态动词及虚拟语气题。may have done用来表示说话人假设某人在过去可能做过某事，而实际上说话人并不能肯定有没有做。must have done用来表示说话人假设某人在过去曾经做过某事，说话人对其假设的内容十分肯定。因此，本题应该选择[A]。

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