【题目】They are singing and dancing.（对画线部分提问）
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【答案】What are they doing?
【解析】
原句句意：他们正在唱歌和跳舞。画线部分是动作，用what提问并用doing代替，are放到主语前，首字母大写，句号变问号，故答案为What are they doing?
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