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[Sentence Correction]
试题详情
题目：
Starfish, with anywhere from five to eight arms, have a strong regenerative ability, and if one arm is lost it quickly replaces it, sometimes by the animal overcompensating and growing an extra one or two.
选项:
A、one arm is lost it quickly replaces it, sometimes by the animal overcompensating and
B、one arm is lost it is quickly replaced, with the animal sometimes overcompensating and
C、they lose one arm they quickly replace it, sometimes by the animal overcompensating,
D、they lose one arm they are quickly replaced, with the animal sometimes overcompensating,
E、they lose one arm it is quickly replaced, sometimes with the animal overcompensating,
答案:
B
提问：
老师好，想问一下，这个B选项，one arm is lost it is quickly replaced是个什么句式，是不是中间应该有个逗号？if one arm is lost, it is quickly replaced。这个逗号是可以省略的吗？
解答：
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