I----a restaurant since last month.a have not been to b have

I----a restaurant since last month.a have not been to b have It has been a month since I have seen you. I have been here since last month.（对since last month部分提问） ha I have been like this since last month 句意? 且请问been充当什么成分 I have been to shanghai,I__________there last month He _____ Greener China since last month.a.join b.have joined Have you been to China?- yes,I ( B) there last year A went B He left last year and____away ever since.A:is B:have been C: I ____him since his childhood.A.have been knowing.B.had been I have been like this since last month 的句意没有表示被动啊为什么还要加been I never there before.A.have;been to B.have;been C.have;gone i have not( ) to them ( ) a.written in1990 b.written last we