问题
单项选择题
（）every day for 20 minutes.
A.Exercise
B.To exercise
C.Should exercise
D.Exercising
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
（）every day for 20 minutes.
A.Exercise
B.To exercise
C.Should exercise
D.Exercising
参考答案：A