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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