Research findings show we spend about two hours dreaming every night, no matter what we ______ during the day.

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问题 Research findings show we spend about two hours dreaming every night, no matter what we ______ during the day.

选项 A、should have done
B、would have done
C、may have done
D、must have done

答案C

解析 C项may have done(可能做了什么),其他几项用法,意义或语气都不对。
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