题目内容

21、One of the most important questions they had to consider was      of public health

A. what                                                                B. this

C. that                                                                 D. which

试题答案

21、C

解析:考查代词及其含义,由语意:他们必须面临的其中一个问题就是公共卫生问题,只有that,可以代替the problem.

相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网