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    精英家教网 > 初中英语 > 题目详情
    I heard someone ________ at the window last night.

    A. knock
    B. knocked
    C. knocks
    D. to knock
    A
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    科目：初中英语 来源：同步题 题型：单选题

    I heard someone ________ at the window last night.
    [     ]
    A. knock
    B. knocked
    C. knocks
    D. to knock

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