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 本题空格处是说不论白天我们可能做了什么。C项"may have done(可能做了什么)"符合题意。其他几项用法中意义或语气都不对。
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