Do you enjoy on the Internet?A. surfingB. surfC. to surfD. surfed

问题补充：

Do you enjoy on the Internet?

A. surfing

B. surf

C. to surf

D. surfed

答案：

(答案→)A. surfing

B. surf

C. to surf

D. surfed

解析：句意是：你喜欢网上冲浪吗。由enjoy doing 动名词作enjoy的宾语可知答案是A。