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    精英家教网 > 小学英语 > 题目详情

    — What are they doing?
    — They are ______________.


    A. singing
    B. sing
    A
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    科目：小学英语 来源：同步题 题型：单选题

    — What are they doing?
    — They are ______________.

    [     ]

    A. singing
    B. sing

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