Studies reveal that people spend two hours dreaming every night, no matter what they ______during the day.

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问题 Studies reveal that people spend two hours dreaming every night, no matter what they ______during the day.

选项 A、should do
B、would have done
C、may have done
D、must do

答案C

解析 本题考查推测句型,情态动词+动词完成式。对过去可能性的推测,C.may(might)have done符合题意。would have done只能用于虚拟过去的动作。
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