问题
选择题
Tom is keen _____ surfing the Internet in his spare time.
A．at
B．on
C．to
D．in
答案
答案：B
搜题请搜索小程序“爱下问搜题”
Tom is keen _____ surfing the Internet in his spare time.
A．at
B．on
C．to
D．in
答案：B