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
B:it is used to
C:it was used to
D:it used to be
正确答案是：
同类题型
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While he_____ on the phone, a man walked into his room.
If you don’t work _______ enough, I don’t think your dream will come_______.
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