the old man has two daughter,_______are doctors.

the old man has two daughter,_______are doctors.
A)both of them B)both of whom C)both who D)they both
请问这是一个定语从句还是同位语从句?我选的是A但是答案是B为什么?

选A 要加 and 成并列句.
b 考查非限制性定语从句,both of whom are doctors=both of two daughters are doctors.
定语从句最重要特点：关系词(whom)代替/相当于先行词(被修饰词：two daughters),并在定语从句中充当一定的成分.

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