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    ----What has happened to Tom? ----He is so tired after walk. A. three hours B. three hours’ C. three hour’s D. three hour 【查看更多】

     

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    —What has happened to Tom?  
    —He is so tired after ______ walk.
    [     ]
    A. three hours  
    B. three hours'  
    C. three hour's  
    D. three hour

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