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In this experiment, they are woken up several times during the night, and asked to report what they____.
A.had just been dreamingB.are just dreaming
C.have just been dreamingD.had just dreamt
C
dream是从过去某时开始一延续到are woken up...and asked to report...这一现在动作之前的动作,故用现在完成进行时。
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