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

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

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

when he got home ,his parents _.were sleep were asleep are sleeping为什么?
were sleeping.当他回家时他的父母正在睡觉.用过去进行时.