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used to be thought that the earth was flat. A. He B. What C. It D. That

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used to be thought that the earth was flat. A. He B. What C. It D. That

________usedto be thought that the earth was flat.

A.He   B.What    C.It     D.That

 

试题答案

答案:C

提示:

It是形式主语,相当于It is thought/said/hopethat。