问题详情

W： Boy, how quickly technology changes! So many people have a computer in their home nowadays.
M：_____________
A.Computers？ There are so many computers in the office.
B.Yes, I know. I feel so behind the time.
C.But I know a lot of computers.
D.Yes, I know. Without computer, there would be no Internet.请帮忙给出正确答案和分析，谢谢！