问题
选择题
The old woman has a son and two daughters, and are college students now.
A．all of whom
B．both of whom
C．all of them
D．both of them
答案
答案：C
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The old woman has a son and two daughters, and are college students now.
A．all of whom
B．both of whom
C．all of them
D．both of them
答案：C