应该说Used it to be thought that the earth was flat吧答案选Used it be thought that the earth was flat觉得不大对劲儿

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应该说Used it to be thought that the earth was flat吧
答案选Used it be thought that the earth was flat觉得不大对劲儿

it used to do sth表示过去常常做什么
它的疑问和否定都有两种表达
疑问:used it to do./ did it used to
否定:it usedn’t to do/ it didn't used to
你的提问就是陈述句it used to be thought that ther earth was flat.采用了第一种疑问式变成的疑问句.以前人们认为地球是平的吗?

我支持答案的选择
used to do。。后接动作
此处纯粹是陈述一个观点---过去认为地球是方的。无动作意义,不用用to