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    New medicines and instruments every day to extend life. A. develop B. are being developed C. are developing D. have developed 【查看更多】

     

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     New medicines and instruments ______ every day to extend life.

    A. develop                                                B. are being developed 

    C. are developing                                       D. have developed

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    New medicines and instruments ______ every day to extend life.

    A. develop      B. are being developed 

    C. are developing   D. have developed

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    New medicines and instruments ______ every day to extend life.

    A. develop                                                B. are being developed

    C. are developing                                       D. have developed

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    New medicines and instruments ______ every day to extend life.

    A. develop      B. are being developed

    C. are developing   D. have developed

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    New medicines and instruments ______ every day to extend life.

        A. develop                  B. are being developed

    C. are developing           D. have developed

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