He _____ unwisely, but he was at least t

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问题 He _____ unwisely, but he was at least trying to do something helpful.A.may have actedB.must have actedC.should not actD.would not act

选项 A.may have acted
B.must have acted
C.should not act
D.would not act

答案 A

解析 句意: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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