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

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

选项 A、should
B、would
C、may
D、must

答案C

解析 本题句意:研究结果表明,我们每天晚上花费大约两个小时做梦,无论我们在白天可能做了什么。should have done“本应该做某事”,would have done用于对过去事实的虚拟,may have done“可能已经做了某事”,must have done“一定已经做了某事”,故选C。
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