问题
选择题
We can learn English by ________ .
A. watching TV B. watch TV C. to watch TV
答案
答案：A
by是介词，后跟动词时要用动词的-ing形式。
搜题请搜索小程序“爱下问搜题”
We can learn English by ________ .
A. watching TV B. watch TV C. to watch TV
答案：A
by是介词，后跟动词时要用动词的-ing形式。
