问题描述：
The old man has two daughters,__are doctors
both of them /both of whom /both who /they both 这里是填哪个呢? 请高手解释下,谢谢!
both of them /both of whom /both who /they both 这里是填哪个呢? 请高手解释下,谢谢!
问题解答：
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