问题
选择题
One of the most important questions they had to consider was _____ of public health. [ ]
A. what
B. this
C. that
D. which
答案
答案：C
搜题请搜索小程序“爱下问搜题”
One of the most important questions they had to consider was _____ of public health. [ ]
A. what
B. this
C. that
D. which
答案：C