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    in the queue for half an hour.Tom suddenly realized that he had left his wallet at home． Having waited 【查看更多】

     

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    ________in the queue for half an hour，Tom suddenly realized that he had left his wallet at home.
    [     ]
    A．To wait  
    B．Have waited
    C．Having waited  
    D．To have waited

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    ________in the queue for half an hour，Tom suddenly realized that he had left his wallet at home．

    [　　]

    A．To wait
    B．Have waited
    C．Having waited
    D．To have waited

    查看答案和解析>>


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