It used to be thought the Earth was flat.A. asB. whenC. sinceD. that

发布时间：2020-08-14 23:40:19

It used to be thought      the Earth was flat.
A. as
B. when
C. since
D. that

网友回答

A. as
B. when
C. since
(答案→)D. that
解析：it 为形式主语，此句为 People used to think that the Earth was flat 的被动语态形式。
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