Found throughout Central and South America, sloths hang from trees by long rubbery limbs and sleep fifteen hours a day, moving infrequently enough that two species of algae grow on its coat and between its toes.
(A) sloths hang from trees by long rubbery limbs and sleep fifteen hours a day, moving infrequently enough
(D) the sloth hangs from trees by its long rubbery limbs, sleeping fifteen hours a day and moving so infrequently
OG中有一段这样的解释

“when its is then inserted before long rubbery limbs, it becomes clear that the limbs belong to the sloth, not the tree.” 难道原句中不加ITS会产生这样的歧义吗？

我觉得这个解释有点乱来。

关键点不在于这个上面。

当然加上its，那么根据 Pronoun-Subject一致原则，Limbs只可能是sloths。

但不加 我不认为是大问题、

Found throughout Central and South America, sloths hang from trees by long rubbery limbs and sleep fifteen hours a day, moving

                                                                         这里用复数

infrequently enough that two species of algae grow on its coat and between its toes.

                                                                          这里用单数
泛指一类的名词，要不全部单数。后面用it/its

要不全部用复数，后面用they。

如果想表示其中一个，前面复数，后面用one

 D中不加its也可以判断，limbs不是trees的，因为如果要指代trees，必须用复数

感觉答案并没有特别注重这一点，这算是一个更优选择吧，有的话更好，没有的话也

不错

记得昨天做prep里的一道题，也是有个move itself from... to ...，大概GMAT认为

加了以后会更明确