In my opinion, life in the twenty-first
题型：选择题
问题：
In my opinion, life in the twenty-first century is much easier than _____. [ ]
A. that used to be
B. it is used to
C. it was used to
D. it used to be
In my opinion, life in the twenty-first century is much easier than _____. [ ]
A. that used to be
B. it is used to
C. it was used to
D. it used to be