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英语问题用适当形式和when、while填空 They____(eat)dinner_____someone_____(

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英语问题
用适当形式和when、while填空
They____(eat)dinner_____someone_____(knock)at the door just now
I___(meet)an old friend____I____(walk)in the street one hour ago
The TV____(catch)fire___they_____(work)yesterday
She_____(take)a shower_____the telephone____(ring)yesterday
It____(start)to rain____I_____(walk)to school two days ago
_____he_____(arrive)at the airport just now,his friends___(wait)for them
英语问题用适当形式和when、while填空 They____(eat)dinner_____someone_____(
were eating, when knocked.
met when was walking.
caught, while.
was taking, when rang.
started, when was walking
when arrived, were waiting
when while主要区别就是while可以表示一段时间,when表示时间点