In this experiment, they are woken up several times during the night, and asked to report what they＿＿＿＿
A.had just been dreaming
B.are just dreaming
C.have just been dreaming
D.had just dreamt
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C解析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。