(2017·全国卷Ⅰ)Thistrend,

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(2017·全国卷Ⅰ)Thistrend,

(2017·全国卷Ⅰ)This trend, ________ was started by the medical community (医学界) as a method of fighting heart disease, has had some unintended side effects such as overweight and heart disease.

【回答】

which 先行词为this trend,且非限制*定语从句中缺少主语,故用which引导该定语从句。

知识点:定语从句

题型:阅读填空

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