(2017·全國卷Ⅰ)Thistrend,

問題詳情：

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

【回答】

which　先行詞為this trend，且非限制*定語從句中缺少主語，故用which引導該定語從句。

知識點：定語從句

題型：閲讀填空