how do you like beijing .Mr smith?oh ,i___ such a beautiful
how do you like beijing .Mr smith?oh ,i___ such a beautiful city before
A.don't visit B.didn't visit C.haven't visited D.hadn't visited
why didn't you go to the cinema yesterday?
because i ____ the film before
A.had seen B.have seen C.have watched D.had watched
这两道题的区别是什么,