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    13、Nowadays business ______ on the Internet is growing rapidly, and this is a strong temptation for hackers, who are looking for ways to break into computer system．

    A．having been done                          B．to have been done

    C．to do                                           D．done

    13、D

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    Nowadays business ______ on the Internet is growing rapidly, and this is a strong temptation for hackers, who are looking for ways to break into computer system．

    A．having been done                          B．to have been done

    C．to do                                           D．done

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