2. 考研
  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 本题考查情态动词。根据选项判断，“情态动词+have done”的结构表示对过去情况的推测：may have done-表示过去可能已经发生的动作；must have done表示过去一定做过某事。but是转折连词，其之后的内容表示至少他想做点有帮助的事，由此可知，他之前行事的方式可能不理智，故答案为A项。should do表示应该做某事；would do表示相对于过去某个时间而言即将发生的动作。
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