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题库 / Prep2007E2-SC-120
Although the turtle has been toothless for more than 150 million years, in some contemporary turtle species the moderately sharp and jagged edges of their horny jaws function for teeth.
their horny jaws function for teeth
its horny jaws function for teeth
its horny jaws function as do teeth
the horny jaws function as teeth do
the horny jaws function as teeth
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The possessive pronoun actually NEEDS to be done away with, as it has no proper antecedent. The best approximation to an antecedent is 'the turtle,' but that doesn't work because, as used here, 'the turtle' refers to the entire range of turtle species throughout evolutionary history - not just the 'contemporary turtle species' described in the latter part of the sentence.
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