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    They have been skating . A. for three hours ago B. since three hours ago C. three hours ago D. since three hours 【查看更多】

     

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    They have been skating ______.   
    [     ]
    A. for three hours ago
    B. since three hours ago     
    C. three hours go 
    D. since three hours

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    They have been skating ______.
    [     ]
    A. for three hours ago
    B. since three hours ago
    C. three hours ago
    D. since three hours

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    They have been skating _______.

    [     ]

    A. for three hours ago
    B. since three hours ago
    C. three hours ago
    D. since three hours

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    They have been skating __________.

    　　 A. for three hours ago　　　　　　　　　 B. since three hours ago

    　　 C. three hours ago　　　　　　　　　　　　　D. since three hours

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    They have been skating _________．

    [　　]
    A．

    for three hours ago

    B．

    since three hours ago

    C．

    three hours ago

    D．

    since three hours

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