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 may have done sth意为“可能做了某事”。must have done sth表示推测,作“肯定做了某事”讲。would have done sth意为“本来可能做了某事”。should have done sth作“本来应该做某事(而实际未做)”讲。
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