All the cloned animals have so far suffered from some serious disorders, many of dying soon after birth．
A. that
B. whom
C. which
D. them ．
网友回答
A. that
B. whom
C. which
(答案→)D. them ．
解析：句意：到现在为止所有的克隆的动物有有一些严重的疾病，很多出生后不久就死了。这里逗号后面的动词dying不是谓语动词，而是非谓语，所以判断是独立主格结构，用逻辑主语+非谓语动词，用them代替the cloned animals选D。