The old man has two daughters, ______ are doctors.A、both of themB、both of whom

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问题 The old man has two daughters, ______ are doctors.

选项 A、both of them
B、both of whom
C、both who
D、they both

答案 B

解析本题为非限制性定语从句，关系代词whom做介词of的宾语指代two daughters，在从句中做主语。

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