______ that the earth was flat?A、Used it to be thoughtB、Did it used to be thoug

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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

解析本题考查的是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...?因此A项为正确答案。

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