although the turtle has been toothless for more than 150 million years, in some contemporary turtle species the moderatley sharp and jagged edges of their horny jaws function for teeth.
A. their horny jaws function for teeth
B.its horny jaws function for teeth
c.its horny jaws function as do teeth
D.the horny jaws function as teeth do
E.the horny jaws function as teeth
e对, B: its 指代错 为什么?
B its指代没有明显错误, 是function as的用法错了
毕竟不是官方的解释,有不对的地方很正常的,多讨论吧
function as sth后面不能加do的
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