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    ---How long do you spend your dog? ---Less than hour. A. walking, an B. walk, an C. walking, a D. walk, a 【查看更多】

     

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    —How long do you spend __________ your dog?
    —Less than __________ hour.

    [     ]

    A. walking, an
    B. walk, an
    C. walking, a
    D. walk, a

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