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
网友回答
A. many of which
B. many of whom
C. many of them
D. many of that
解析：C
解析 由后面的dying可知这里不是完整的句子(没有谓语动词)，故不能选A或B构成定语从句，此处考查独立主格结构。