问题
选择题
It's good for us to _______ every day. [ ]
A. do morning exercise
B. do morning exercises
C. doing morning exercise
D. doing morning exercises.
答案
答案：B
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It's good for us to _______ every day. [ ]
A. do morning exercise
B. do morning exercises
C. doing morning exercise
D. doing morning exercises.
答案：B