She had two daughters, ______ became doctors.

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问题 She had two daughters, ______ became doctors.

选项 A、all the them
B、all of who
C、both of whom
D、all of whom

答案C

解析 所以A项可先首先排除,此外由于all、通常表示的是三个或三个以上的物,所以B项和D项也可以排除。
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