问题
选择题
The experiment show that proper amount of exercise, if ________ regularly, can improve our health. [ ]
A. carry out
B. carried out
C. to carry out
D. being carried out
答案
答案：B
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The experiment show that proper amount of exercise, if ________ regularly, can improve our health. [ ]
A. carry out
B. carried out
C. to carry out
D. being carried out
答案：B