(2020·湖北省黃岡市高三質量檢測)Andit'sfastbecomingoneofthegreatestp...

問題詳情：

(2020·湖北省黃岡市高三質量檢測)And it's fast becoming one of the greatest public health challenges ________ we face in the 21st century.

【回答】

that　空格處引導定語從句，修飾先行詞challenges，在從句中作賓語；由於先行詞前有最高級the greatest修飾，所以只能用that引導。

知識點：定語從句

題型：閲讀填空