Before the police arrived,the alien left the shop ,句中能用when或after代替before吗,为什么?

英语翻译2 Although the police searched everywhere,neither the missing boy nor his dog could be found.3Refusing the offer,I explained that I had already been offered a job by another company.4He fought the wolves off for three hours before help ar Before the police arrived,the alien left the shop and then visited the Musrum of Flight Before the police arrived,the alien left the shop.(为什么选择arrived而不用reach） Before the police arrived,the alien left the shop ,句中能用when或after代替before吗,为什么? Before the police officer got there,the thieves____(逃跑）为什么不用过去完成时 The man had robbed the bank and got away with a lot of money before the police came翻译汉语 Ar You The One tell the police the _ the police arrived,the alien left the ground A:before,B:whenC:after,选before麻烦各位回答具体点能不能从语法角度讲讲 i didn't know you had called the police before l came here为什么是didn't 而不是don't the police station是什么意思 Call The Police 歌词 Quick!Call the police call the police是什么意思 Police fire into the Circle the police officer so are the police THE BANGVILLE POLICE怎么样