问题
选择题
In my opinion, life in the twentyfirst 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
答案
答案：D
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In my opinion, life in the twentyfirst 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
答案：D