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单选题 _____ that the earth was flat?

A

Used it to be thought

B

Used to it be thought

C

Does it used to be thought

D

Did it used to be thought

正确答案 :A

解析

【精析】A句意:过去人们认为地球是平的吗?情态动词题。used to:曾经,过去常常发生的事。变为一般疑问句时既可借助于助动词did,也可将used提前。借助于助动词did时其后应跟陈述句语序,且used应用原形,故B、D项均不正确。本题还原为正常陈述句语序应为It used to be thought that the earth was flat. 综合可知,A正确。