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 not act
D、would not act

答案A

解析尽管他的行为不够明智，但至少他在努力做一些有益的事情。may用于从句中表示让步，不管，不论；尽管。must have acted用在此处语气不正确。由从句可知，事件发生在过去，故C项D项不可选，前后时态搭配不一致。

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