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    A study in the USA in 1977 showed that the chemical AsA in aspirin could prevent a stroke. A.carrying out B.carried out C.working out D.worked out 【查看更多】

     

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    A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.

    A．carrying outB． carried outC．working outD．worked out

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    A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.

    A．carrying out

    B． carried out

    C．working out

    D．worked out

     

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    A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke.


    1. A.
      carrying out
    2. B.
      carried out
    3. C.
      working out
    4. D.
      worked out

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    A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke．

    [　　]

    A．carrying out

    B．carried out

    C．working out

    D．worked out

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