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    It was not until the 19th century heat was considered a form of energy. A. that B. which C. since D. when 【查看更多】

     

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    .

    It was ______ the 19th century_____ heat was considered to be a form of energy.

    A．not until; that

    B．until; that

    C．not until; when

    D．until; when

     

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    .

     It was ______ the 19th century_____ heat was considered to be a form of energy.

    A. not until; that    B. until; that

    C. not until; when    D. until; when

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