问题: The old man has two daughters,_____are doctors.
A. all of them B.both of them C.both of whom
分析哦
解答:
The old man has two daughters,_____are doctors.
A. all of them B.both of them C.both of whom
选C。理由是：
在英语句子中，任何一个句子只能有一个谓语，否则必须有连词。而这个句子有两个谓语has和are而没有连词，所以AB都不行。只能是C。
Eg：
1. Told many times，he still didn‘t know the answer。
2. He was told many times，but he still didn‘t know the answer。
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