问题
选择题
All 5 children of the Blacks, _______ are now working abroad, will come back for their parents’ 50th wedding anniversary.
A．two of whom
B．two of them
C．both of whom
D．both of them
答案
答案：A
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。