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    All his attempts to unlock the door were , because he was using the wrong key. A. in return B. in vain C. in doubt D. in time 【查看更多】

     

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    All his attempts to unlock the door were   , because he was using the wrong key.

    A．in return

    B．in vain

    C．in doubt

    D．in time

     

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    All his attempts to unlock the door were    , because he was using the wrong key.

           A. in return         B. in vain      C. in doubt    D. in time

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     All his attempts to unlock the door were      , because he was using the wrong key.

        A. in return                  B. in vain                      C. in doubt                 D. in time

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    All his attempts to unlock the door were   , because he was using the wrong key.

    A．in returnB．in vainC．in doubtD．in time

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