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    Unless to speak.you should remain silent at the conference. A．invited B．inviting C．being invited D．having invited 【查看更多】

     

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    Unless ___ to speak，you should remain silent at the conference． 
     A．invited   B．inviting   C．being invited   D．having invited

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    Unless ____ to speak，you should remain silent at the conference．

    A．invited

    B．inviting

    C．being invited

    D．having invited

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    Unless ________to speak，you should remain silent at the conference．

    A．invited　　   B．inviting　　 C．being invited    D．having invited

     

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    Unless ________to speak，you should remain silent at the conference．

    A．invited　　   B．inviting　　 C．being invited    D．having invited

     

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