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.

admin2009-01-05  43
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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