Itusedtobethought_____theEarthwa

发布时间：2020-07-12 01:01:54

It used to be thought _____ the Earth was flat












A.as











B.when










C.since










D.that

网友回答

D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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