which, who, whom, what, where, when The treatment, _______ is being tried by researchers at four hospitals, has helped patients

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问题 which, who, whom, what, where, when
The treatment, _______ is being tried by researchers at four hospitals, has helped patients ______ have failed to respond to other remedies.

选项

答案which,who

解析 第一空的先行项是the treatment且在关系分句中作主语,因此引导词应为which。第二空的先行项是patients且在关系分句中作主语,因此引导词应为who。答案为which,who。
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