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    精英家教网 > 高中英语 > 题目详情
    ______ was unknown to us, he always said, was how the teacher knew the secret.

    A. It  
    B. What
    C. That  
    D. As
    B
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    科目：高中英语 来源：同步题 题型：单选题

    ________ was unknown to us, he always said, was how the teacher knew the secret.
    [     ]
    A．It  
    B．What
    C．That  
    D．As

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