问题
选择题
As we know, ______ is good exercise and it is necessary for health.
[ ]
A. walk
B. to walk
C. walking
D. walked
答案
答案：C
搜题请搜索小程序“爱下问搜题”
As we know, ______ is good exercise and it is necessary for health.
[ ]
A. walk
B. to walk
C. walking
D. walked
答案：C