23. I have two sisters working in this city.A. both of themB. both of whom C. and both o

问题补充：

23. I have two sisters, working in this city.

A. both of them

B. both of whom

C. and both of them

D. both of them are

答案：

(答案→)A. both of them

B. both of whom

C. and both of them

D. both of them are

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