E-mai,as well as telephone,( )an important part in our daily life.
A.is playing B.is played C.play D.have played
is playing an important
My father( )in the factory since it ( )in 1956.
A.worked,opened
B.has worked,opened
C.had worked,opened
D.has worked.had opened
商店开业（open）无须用被动语态,即has been open为什么选项的open全加ed
-（ ）you( )the text yet?
-Yes,we( )it two hours ago.
yet不是用现在完成时吗?
This kind of shoes( )well.All the shoes( )out.
A.sell,have sold
B.are sold,have sold
C.sells,have been sold
D.is sold,have been sold
我知道sell是主动表被动,但为什么第二空是have been sold?
如果是一般过去时的被动语态，应该是The door was open而不是The door was opened吧？