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    28．Not until the early years of 19th century what heat is. A. man did know B. man knew C. didn’t man know D. did man know 【查看更多】

     

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    Not until the early years of 19th century ________ what heat is．

    [　　]

    A．man did know

    B．man knew

    C．didn't man know

    D．did man know

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    Not until the early years of the 19th century______ what heat is.

    A．man did know

    B．man knew

    C．didn’t man know

    D．did man know

     

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    Not until the early years of the 19th century _________．


    1. A.
      man did know heat is what
    2. B.
      man know what is heat
    3. C.
      did man know what heat is
    4. D.
      didn’t man know heat

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    Not until the early years of the 19th century ___ know what heat is.
    [     ]
    A. man did　
    B. man　
    C. didn't man　
    D. did man

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    Not until the early years of the 19th century　　　　 what heat is.?

    A. man did know　　　　　　　　　 B. man know ?

    C. didn’t man know 　　　　　　　 D did man know?

     

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