I spent all my spare time __________ (surf) the Internet.

问题描述:

I spent all my spare time __________ (surf) the Internet.

surfing

surfing ,spend +on sth 或者(in可省略)doing sth

【答案】
I spent all my spare time [surfing] the Internet.
【分析】
spend...on sth./ (in) doing sth.花费...在某事上 / 做某事