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    The symbolic one-hour switch-off first in Sydney in 2007 has become an annual global event. A. to hold B. being held C. to be held D. held 【查看更多】

     

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    The symbolic one-hour switch-off first _____ in Sydney in 2007 has become an annual global event.

    A. to hold                    B. being held                      C. to be held                D. held

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    .
    The symbolic one-hour switch-off first _____ in Sydney in 2007 has become an annual global event.

    A．to hold B．being held C．to be held D．held

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