The old man has two daughters, ______ are doctors.

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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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