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    Scientific experiments by students without the teachers’ instructions can be dangerous. A. carry out B. carrying out C. carried out D. carrying 【查看更多】

     

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    Scientific experiments __________ by students without the teachers’ instructions can be dangerous.

       A. carry out     B. carrying out      C. carried out       D. carrying

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    Scientific experiments __________ by students without the teachers’ instructions can be dangerous.

      A. carry out     B. carrying out      C. carried out       D. carrying

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    Scientific experiments __________ by students without the teachers’ instructions can be dangerous.

       A. carry out     B. carrying out      C. carried out       D. carrying

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    Scientific experiments __________ by students without the teachers’ instructions can be dangerous.

    A．carry out

    B．carrying out

    C．carried out

    D．carrying

     

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