when he got home ,his parents _.were sleep were asleep are sleeping

when he got home ,his parents _.were sleep were asleep are sleeping
为什么?
英语人气:166 ℃时间:2019-10-11 19:22:06
优质解答
were sleeping.当他回家时他的父母正在睡觉.用过去进行时.从上面三个答案中选were asleep.sorry.when引导的是过去式后面也应相应用过去式。
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