Studies reveal that people spend two hours dreaming every night no matter what they _____
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Studies reveal that people spend two hours dreaming every night, no matter what they ______during the day.
A．should do
B．would have done
C．may have done
D．must do
请帮忙给出正确答案和分析，谢谢！
更新中~-
正确答案：C
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)havedone符合题意。wouldhavedone只能用于虚拟过去的动作。