Prep07上的一道题:
Although the turtle has been toothlessfor more than 150 million years, in some contemporary turtle species the moderately sharp and jaggededges 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
OA:E
想请教一下:A中their的为什么错?指代对象为什么不能是turtle species?
十分感谢!
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