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    _____ are the birds doing? They are singing in a tree.

    A. Who
    B. What
    C. How
    D. Where
    B
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    科目：高中英语 来源：专项题 题型：单选题

    _____ are the birds doing? They are singing in a tree.
    [     ]
    A. Who
    B. What
    C. How
    D. Where

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