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.


one arm is lost it quickly replaces it, sometimes by the animal overcompensating and

one arm is lost it is quickly replaced, with the animal sometimes overcompensating and

they lose one arm they quickly replace it, sometimes by the animal overcompensating,

they lose one arm they are quickly replaced, with the animal sometimes overcompensating,

they lose one arm it is quickly replaced, sometimes with the animal overcompensating,

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题目分析：
略

选项分析：

A选项：在一个句子中，代词it如果反复出现，其必须指代同一个单数名词（they也是同样的道理）。本选项中it quickly replaces it显然是不正确的，这两个it在逻辑上应该指代不同对象。另外，by  the animal overcompensating中的by是介词，身后只能添加名词短语（注意区分这种情况和独立主格的情况）。因此，overcompensating必须为动名词短语（未划线部分的growing也是同理）。如果想给动名词短语添加逻辑主语，只能用所有格的形式，即：
animal‘s overcompensating。

B选项：Correct. 本选项在语法和逻辑上均是正确的。with the animal sometimes overcompensating是独立主格结构。

C选项：by  the animal overcompensating错误同(A)。

D选项：两个代词they在逻辑上指代对象应该是不同的，该指代错误同(A)。

E选项：overcompensating和growing均是animal发出的动作，两者应保持平行。因此，overcompensating身后不能加逗号。两者平列时，两者之间不能用逗号隔开。

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