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
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
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。