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 根据题意，这件事情已经发生了，因此应用“情态动词+have done”表示对过去事实的推测。may与must在语气的肯定程度上有很大区别：must的语气相当肯定，而may的肯定程度要弱一些。本题并不是确定性的推测，因此应选A。
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