1.Who did the teacher ( )the job?
A.have done
B.have do
C.had done
D.has done
请问这句话什么意思啊
2.We visited several scenic spots,a friend of ours ( )as our guide.
A.acted
B.acting
C.was acting
D.to be acting
A和B 哪个对啊
3.I can excuse ( )to know nothing about it.
A.he pretend
B.his pretending
C.him to pretend
D.him pretended
4.I'm sorry ( )you.
A.to have delayed answering
B.delaying to answer
C.delayed answered
D.to delay to answer
请适当解释一下,谢谢