很高兴能够在这里回答你的问题,
B
be asleep 睡觉
当你睡觉时,你最好开着窗户.
be sleeping 是正在睡觉,
而这里是睡觉的时候,为一般现在时,所以选B
You'd better keep the windows open when you are_____ A sleeping B asleep
You'd better keep the windows open when you are_____ A sleeping B asleep
英语人气：231 ℃时间：2019-11-22 16:19:26
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