2. 外语
  3. Research findings show that we spend about two hours dreaming every night no matter what we______ dialog the day.

Research findings show that we spend about two hours dreaming every night no matter what we______ dialog the day.

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问题 Research findings show that we spend about two hours dreaming every night no matter what we______ dialog 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 may have done"(不管我们白天)可能做了些什么”，符合句意。should have done“本该做(但实际未做)”；would have done表示与过去相反的假设；must have done是对已发生的情况作肯定推测。
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