1.Why didn't you watch the show yesterday?
Because i ____it before.
A.had watched B.have watched c.had seen D.have seen
2.Mary hasn't phone us yet.what____to her?
A happens B has happened
3.There is a crossing.We don't know_____
A.where we would go B which street to turn to
说下原因啊 正确答案是a b b 我主要不知道为什么 要写全些