英语中as when while该怎么用

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英语中as when while该怎么用

七、while与when以及as之间的区别.1.当从句中的谓语动词是持续性的动作时,我们可以用while,when或as.While / When / As I was walking down the street,I noticed a police car in front of the bank.我顺着马路往前...