我又来困惑OG了

163. 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
(B) sloths hang from trees by long rubbery limbs, they sleep fifteen hours a day, and with such infrequent
movements
(C) sloths use their long rubbery limbs to hang from trees, sleep fifteen hours a day, and move so
infrequently
(D) the sloth hangs from trees by its long rubbery limbs, sleeping fifteen hours a day and moving so
infrequently
(E) the sloth hangs from trees by its long rubbery limbs, sleeps fifteen hours a day, and it moves
infrequently enough

不明白,C为什么错呢.看不出SLEEPING和 MOVING怎么变成伴随状态的,读了N遍还是觉得他们是并列动作~~

那C如果是use sleep move并列，而不是hang sleep move并列咧？

而且 by +doing 才表示动作的方式啊 by + n. 表动作的执行者是 n.啊？？（刘zm上说的）那么by+n.不该改成 by using n.或 through + n.吗？

如果这样的话就只有C才对吧？

后面的是two species of algae grow on its coat and between its toes.

C的主语是复数sloths

C很容易让人理解成是 to hang ..., sleep ... and move ...会造成歧异。