练习册

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    It used to be thought the Earth was flat.A. as B. when C. since D. that[解析]D.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. 【查看更多】

     

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    It used to be thought _____ the Earth was flat.

    A. as                                                        B. when

    C. since                                                    D. that

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    It used to be thought _____ the Earth was flat.

    A. as                                                        B. when

    C. since                                                    D. that

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    . It used to be thought _____ the Earth was flat.

    A. as                 B. when           C. since             D. that

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    It used to be thought _____ the Earth was flat.

    A. as       B. when

    C. since   D. that

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    . It used to be thought _____ the Earth was flat.

    A. as       B. when

    C. since   D. that

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