1.____ turn is it ____ the classroom?

1.____ turn is it ____ the classroom?
A.Who; clean B.Whose; to clean
C.Whom; cleaning D.Which; cleaned
2.So you like traveling,____?
A.do you B.don’t you
C.aren’t you D.haven’t you
3.--- Tom said he’d been to China.
--- He did,____?
A.didn’t he B.did he
C.so he did D.so he didn’t
4.All ____ has already been done.
A.can be done B.should be done
C.that can be done D.what should be done
可是答案上写的是2A 3B，其他两个都对，