So far the majority of cloned animals have suffered from some different serious disorders, died soon after birth.
A. many of which
B. many of whom
C. many of them
D. many of that
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(答案→)A. many of which
B. many of whom
C. many of them
D. many of that
解析：本题考查定语从句，先行词为cloned animals，故为many of cloned animals died soon after birth，选A。