题目：
The experiment shows that proper amounts of exercise,if _____ regularly,can improve our health. [ ]
A. being carried out
B. carrying out
C. carried out
D. to carry out
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析：肝右静脉将肝右叶分成右肝前后段
