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问题: The body is comoposed of many organs,each___a special function to perform.

the right answer is:having
i choose :has
tell me why

解答:

The body is comoposed of many organs 这是主句,is comoposed 是谓语动词。
each___a special function to perform.只是从句修饰organs。如果填has,句子就有两个谓语动词了,
having是非谓语形式,所以填它。