---- Do you surf the Internet a lot？
---- Well, , I’m too busy with work to surf the Net.
A. all right
B. I have no idea
C. at last
D. to tell you the truth
网友回答
A. all right
B. I have no idea
C. at last
(答案→)D. to tell you the truth
解析：考查交际用语。A好的；B我不知道；C最后；D说实话；句意：—你经常上网吗？—说实话，我忙于工作，忙于时间上网。根据句意说明D正确。