Shewentupstairstoseeifhewasstillasleep

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She went upstairs to see if he was still asleep_________

A. at one time B. now and then

C. in the same time D. behind the time

【解析】选B。考查短语辨析。句意：她不时地到楼上去看看他是否仍在睡觉。at one time过去曾经；now and then时常地；in the same time在……同时；behind the time不合时宜。故选B。