The old woman has a son and two daughters andare college students now.A. all of whomB. bo

问题补充：

The old woman has a son and two daughters, andare college students now.

A. all of whom

B. both of whom

C. all of them

D. both of them

答案：

A. all of whom

B. both of whom

(答案→)C. all of them

D. both of them

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