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    21．I kept looking at the man, wondering . A．whether I have seen him before B．where I had seen him before C．that I had seen him before D．when I had seen him before 【查看更多】

     

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    I kept looking at the man, wondering _______.

    A．whether I have seen him beforeB．whether I had seen him before
    C．that I had seen him beforeD．when I saw him before

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    I kept looking at the man, wondering ________.

    [　　]

    A．whether I have seen him before

    B．where I had seen him before

    C．that I had seen him before

    D．when I had seen him before

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