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    What are they doing? They . 【查看更多】

     

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    What are they doing?   They are              .
    [     ]
    A. play             
    B. plays             
    C. playing  

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    — What are they doing?
    — They are ______________.

    [     ]

    A. singing
    B. sing

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    — What are they doing?
    — They are ______________. 

    [     ]

    A. play
    B. talk
    C. laughing

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    — What are they doing?
    — They are _____________.
    [     ]
    A. talk
    B. sing
    C. working

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    What are they doing?  They're __________ fun.
    [     ]
    A. has   
    B. having     
    C. have

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