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as soon as,upon,on的区别

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as soon as,upon,on的区别
举例说明后面应该加什么!
例题：_________ arriving home,she threw herself into the sofa,exhausted.
A.On B.In C.As soon as D.The moment
正确答案是A
1.as soon as=the moment都是连词,它后面引导的是一个时间状语从句
如:As soon as she arrived home,she threw herself into the sofa,exhausted.
2.on/upon是个介词,后加名词(短语)形成介宾短语,结构为on/upon sb(宾格)/one's doing sth,其中sb(宾格)/one's和doing根据句意有可能不须出现.
如:Upon/On (her) arriving home,she threw herself into the sofa,exhausted.
Upon/On his/him arriving home,his parents told him the news.
Upon/On his arrival,his parents told him the news.
楼主肯定能区分介词和连词的区别!算我罗嗦了!
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