Question

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

Answer 1

C

本题考查独立主格结构。分析句中可知，后面一句没有谓语动词，故非考查定语从句，代词them指代disorders，故选C。