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    The clever boy made a hole in the wall, he could see what it was going on inside the house. A．on which B．at which C．through which D．in which 【查看更多】

     

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    The clever boy made a hole in the wall, ______ he could see what it was going on inside the house.
    [     ]
    A. on which
    B. at which
    C. through which
    D. in which

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