——You can’t imagine fantastic fun web chatting is.——Really? But it may cause a lot of tro

问题补充：

——You can’t imagine fantastic fun web chatting is.

——Really? But it may cause a lot of trouble sometimes.

A. what

B. how

C. why

D. so

答案：

(答案→)A. what

B. how

C. why

D. so

解析：本题是在宾语从句中融入了一个感叹句：what fun!