应该说Used it to be thought that the earth was flat吧

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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?

应该说Used it to be thought that the earth was flat吧 1._____ used to be thought that the earth was square. believing the earth to be flat,many feared that 中to be flat在 It is strange that he ( )the earth was flat.A think B thinks __ The earth to be flat,many feared that Columbus would fall _____ the earth to be flat,many feared that Columbus would f The idea that earth is flat was ________centuries ago. long ago people b___ that the earth was flat Long ago,people____（believe)that the earth was flat. It （was used to / used to be）quite prosperous in the center There was once an ___ idea that the earth was flat and motio 英语语法小题!it was so heavy that a crane had to be used to remove