Question

【题目】One of the most important questions they had to consider was of public health

A. what B. this C. that D. which

Answer 1

【答案】C

【解析】句意为：他们必须考虑其中最重要的问题是公共卫生。考查that作代词, that 作代词, 往往用于特指, 相当于 “that＋名词”, 它也只能代替事情不能代替人。