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
Tom finish the rest of your homework tonight and _______it to school tomorrow. — I will, Mr. Wu.
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Why not go to see the dolphin show with me?—Because I _____ it.