it's a long time since i saw my sister,why not visit her thi

( )17.—It’s a long time since I saw my sister.—_________ her It is a long time since I saw my sister . It is a long time since i saw my sistter it's a long time since i last saw you It's a long time since i saw you last. It's been a long time since I last saw a film.还是It's a long 1.It's a long time since I left my hometown.A long time __ _ it's a long time since i last saw you这句话有错误么 It's a long time since i saw you last 这句中的it是不是形式主语? I cann't say__I want to visit my grandma.It is a long time s it's quite a long time since i _____（hear）from my cousin in 1.It's a long time since I left my hometown.