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    精英家教网 > 初中英语 > 题目详情
    —What is behind the tree?
    —There must be a dog ______ there.

    A. to sit
    B. sit
    C. sitting
    C
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    科目：初中英语 来源：专项题 题型：单选题

    —What is behind the tree?
    —There must be a dog ______ there.
    [     ]
    A. to sit
    B. sit
    C. sitting

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