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    4．--Do you know or not it’s impolite to smoke during a meal in France? -- Yes.it's impolite． A．that B．whether C．if D．why 【查看更多】

     

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    — Do you know _____ or not it's impolite to smoke during a meal in France?
    — Yes, it's not impolite.

    [     ]

    A. that
    B. whether
    C. if

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