用when,while,as soon as,until,before,after填空
用when,while,as soon as,until,before,after填空
Don't go to sleep _____ you finish your homework.
The children are dancing _____the band is playing.
_____ he came home,I told him about that.
You must wash your hands _____ you eat something.
____he left there,he went to Beijing.
说明原因喔