In this experiment,they are wakened several ttimes during th

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In this experiment,they are wakened several ttimes during the night,and asked to report what t...
In this experiment,they are wakened several ttimes during the night,and asked to report what they_.
A.had just been dreaming
B.have just been dreaming.
C.are just dreaming
D.had just dreamt
答案是选B,

翻译
在这个试验中,他们一个晚上被叫醒几次,要求说出他们刚刚正在做什么梦?
因为是 “正在做”==》所以用 being ==》排除D
因为从睡着到被叫醒是一段时间==》所以用现在完成时（过去完成时表示过去的过去,这里不能用）==》排除 A.C
所以选 B

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