124. Found throughout Central and South America, sloths hang from trees by long rubbery limbs and sleep 15 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 15 hours a day, moving infrequently enough (B) sloths hang from trees by long rubbery limbs, they sleep 15 hours a day, and with such infrequent movements (C) sloths use their long rubbery limbs to hang from trees, sleep 15 hours a day, and move so infrequently (D) the sloth hangs from trees by its long rubbery limbs, sleeping 15 hours a day and moving so infrequently (E) the sloth hangs from trees by its long rubbery limbs, sleeps 15 hours a day, and it moves infrequently enough
这道题，为什么选择D我已经弄懂了，但是我反过来再看，觉得 既然D可以用 do, doing and doing 的结构，那么A中的 do and do,doing 这种结构正确吗？
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发表于 2011-9-29 20:11:35
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