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    2．She heard a boy in the next room now. A. sing B. sang C. singing D. to sing 【查看更多】

     

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    She heard a boy ________ in the next room now.

    [　　]

    A．sing
    B．sang
    C．singing
    D．to sing

    查看答案和解析>>

    She heard a boy ________ in the next room now.

    [　　]

    A．sing
    B．sang
    C．singing
    D．to sing

    查看答案和解析>>


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