I'm glad you come back from the United States.please tell me how long you________there?

I'm glad you come back from the United States.please tell me how long you________there?
A.have stayed.B.had stayed.C.have been staying.D.stayed
A:How do you like the Disney film Frozen?B:_________
A) The tickets sell well.B) I don‟t think so.C) It‟s really worth watching.D) That‟s all right.
After you get off the bus,you can take-------of the two Metro Lines to Zhongshan Park.
A) neither B) both C) either D) any
My parents and l have to------ Europe for holiday for several times in the past ten years.
A.had gone B.have gone C.had been D.have been
说下为什么选这个答案,
A:Would you like me to show you around the Bund?B:________
A) Yes,go ahead.B) Never mind.C) Yes,I'd love to.D) It's very kind of you