Kate and Lily______(正在唱歌）in the next room

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KateandLily______(正在唱歌）inthenextroomKateandLily______(正在唱歌）inthenextroomKateandLily______(正在唱歌）inthe

Kate and Lily______(正在唱歌）in the next room
Kate and Lily______(正在唱歌）in the next room

Kate and Lily______(正在唱歌）in the next room
are singsing 两个人是复数,正在唱歌用现在进行时