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单选题
He ______ unwisely, but he was at least trying to do something helpful.
A
may have acted
B
must have acted
C
should not act
D
would not act
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参考解析
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。
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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