The police left the house( )they had searched.填上合适的关系代词除了that还可以填其他词吗

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） whwn the police arrived the aline left the ground 为什么用when而不用while tell the police the Walk past the police station,turn left and walk on 翻译 where is the police station?walk ( ) and ( ) left.walk straight还是walk straightly？ We all left the police station,convinced that Tom was innocent.这里的convinced是什么用法? Before the police arrived,the alien left the shop ,句中能用when或after代替before吗,为什么? 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 keeping off the police left the