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    The notice hanging on the front wall is meant to the unwanted visitors, especially at working hours. A. keep up B. keep off C. keep from D . keep out 【查看更多】

     

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    The notice hanging on the front wall is meant to ____ the unwanted visitors, especially at working hours.

    A. keep up　 B. keep off　 C. keep from　 D . keep out

     

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