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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专业英语四级

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

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[2009年]设A，B均为二阶矩阵，A，B分别为A，B的伴随矩阵，若|A|=2，|B|=3，则分块矩阵的伴随矩阵为()．