2. 外语
  3. ______ that the earth was flat?

______ that the earth was flat?

admin2014-03-02  15
问题 ______ that the earth was flat?
选项 A、Used it to be thought
B、Did it used to be thought
C、Was it used to being thought
D、Does it used to be thought
答案A
解析 It used to do句型的疑问句形式可以为Used it to do...?或者Did it use to do...?
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