Children need to sleep 9 hours a night 这句话的问句是什么
问题描述：
Children need to sleep 9 hours a night 这句话的问句是什么
答
How many hours do children need to sleep a night?
答
Should children sleep 9 hours a night?
答
Who need to sleep 9 hours a night
How many hours do children need to sleep a night?