题目信息
Elderly patients, many who take expensive brand-name medications daily, could reduce their medical costs by switching to generic drugs and making lifestyle changes.
A:many who
B:many of them who
C:and many of them who
D:many of whom
E:many of which
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已选答案：
正确答案：
D:many of whom
who引导从句的时候可以指代主语或者宾语，whom只能做宾语。但是因为这里是many of，有一个of，介词后面只能加代词的宾格形式，所以是many of whom。
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题目来源
Manhattan
