(2020·湖北省黄冈市高三质量检测)Andit'sfastbecomingoneofthegreatestp...
来源：语文精选馆 3.25W
问题详情：
(2020·湖北省黄冈市高三质量检测)And it's fast becoming one of the greatest public health challenges ________ we face in the 21st century.
【回答】
that 空格处引导定语从句，修饰先行词challenges，在从句中作宾语；由于先行词前有最高级the greatest修饰，所以只能用that引导。
知识点：定语从句
题型：阅读填空
