All 5 children of the Blacks, are now working abroad, will e back for their parents’ 50th wedding anniversary.
A. two of whom
B. two of them
C. both of whom
D. both of them
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(答案→)A. two of whom
B. two of them
C. both of whom
D. both of them
解析：考查定语从句。根据题中逗号，可知考查非限定性定语从句，根据句意5个孩子中的两个孩子，故选A。