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

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、must have done
B、would have done
C、should have done
D、may have done
答案D
解析 “must have+过去分词”意为“(过去)一定做了……”，是对过去情况的肯定推测；“would have+过去分词”意为“(过去)就会做……”，常用于表示对过去情况的假设；“should have+过去分词”意为“(过去)本应该做……(却没有做)”，表示与过去事实相反的情况；“may have+过去分词”意为“(过去)可能做了……”，表示对过去情况可能性的推测。根据句意可知，选D。
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