She has two daughters are nurses. A. all of them B. both of them C. both of whom D. all

问题补充：

She has two daughters, are nurses.

A. all of them

B. both of them

C. both of whom

D. all of whom

答案：

A. all of them

B. both of them

(答案→)C. both of whom

D. all of whom

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