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
选错了,自己查了下,这样理解:这里的as不是连词,所以不能选D,function as sth.,起...的作用,作为,充当。
同意。as既可以作为连词,也可以作为介词。
当as做介词时,它只有一个意思,即,作为。As a teacher, James taught students history.
当as做连词时,连接句子,并且有很多意思:像、因为、当等。但是,做连词时,as不能表示“作为”。
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