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    ----Mike! What are you doing there? ----Listen, Mum! Can you hear somebody upstairs? A. going B. goes C. go D. to go 【查看更多】

     

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    — Mike! What are you doing there?
    — Listen, Mum! Can you hear somebody _____ upstairs?

    [     ]

    A. go
    B. going
    C. to go

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