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

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

 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

试题答案

B

标签：doorthebecausewereunlock

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