2. 外语
  3. He__________unwisely, but he was at least trying to do something helpful.

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。may have done用来提示说话人假设某人在过去可能曾做过某事，而实际上有没有做说话人不能肯定(不过，说话人一般认为没有发生)。must have done用来提示说话人假设某人在过去曾做过某事，说话人对其假设的内容十分肯定。
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