So far all cloned animals have suffered from some different serious disorders, dying soon

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 that
D. many of them

A. many of which B. many of whom C. many of that (答案→)D. many of them解析：考查独立主格结构。 根据句中的dying看此处不能是从句所以排除A、B、C三个选项。 到目前为止所有的克隆动物都有不同类型的严重紊乱，好多一降生就死去了。

对的，就是这个意思