He______unwisely, but he was at least trying to do something helpful.A、may have

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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。may have done表示“某人可能做过某事，但实际上并未做”；而must have done则表达肯定意味。从句意上看，前者更符合。因此选A。

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