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    With the help of high technology, more and more new substances in the past years. A. discovered B. have discovered C. had been discovered D. have been discovered 【查看更多】

     

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    With the help of high technology, more and more new substances____in the past years.

    A. discovered   B. have discovered   C. had been discovered   D. have been discovered

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    With the help of high technology, more and more new substances ______ in the past years.

       A. discovered          B. have discovered

    C. had been discovered  D. have been discovered

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    With the help of high technology, more and more new substances ______ in the past years.

       A. discovered        B. have discovered 

    C. had been discovered  D. have been discovered

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    With the help of high technology, more and more new substances            in the past years.

    A．discovered

    B．have discovered

    C．had been discovered

    D．have been discovered

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     With the help of high technology, more and more new substances ______ in the past years.

       A. discovered                  B. have discovered

    C. had been discovered         D. have been discovered

     

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