题目

So far all cloned animals have suffered from some different serious disorders, ________ dying soon after birth. A．many of which  B．many of whom C．many of them  D．many of that 答案：C解析：由于空格后面是非谓语动词dying，而不是谓语动词，由此可以排除A、B两项；另外，C项中的them代指前面的名词animals，D项的that 显然代指不当。因此答案是C项，为独立主格结构。

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