yylcf
幼苗
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姜还是老的辣,用when,伴随时间的,完整的句子是when you drink or eat outside,you should keep the garbage until you find a trash can,因为从句与主句主语 一样,从句故可以省去,将从句动词变为进行时
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yylcf
when you drink or eat outside,you should keep the garbage until you find a trash can这个句子用while可以吗,while引导时间状语从句时,与when有一定的区别,http://zhidao.baidu.com/question/397839904.html 这里很详细。