[問題] PP2-120
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.
1) their horny jaws function for teeth
2) its horny jaws function for teeth
3) its horny jaws function as do teeth
4) the horny jaws function as teeth do
5) the horny jaws function as teeth
請問一下 最後 4 & 5 該怎麼做決定
答案是5
是因為單存考片語function as不用在補上動詞嗎???
謝
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