问题
选择题
In my opinion, life in the 21st century is much easier than _____. [ ]
A. that used to be
B. it used to be
C. it was used to
D. it is used to
答案
答案：B
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In my opinion, life in the 21st century is much easier than _____. [ ]
A. that used to be
B. it used to be
C. it was used to
D. it is used to
答案：B