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    A. challenge B. challenging C. challenges D. challenged 【查看更多】

     

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    A person , when_________，can often do what is normally beyond his ability.

    A. challenged       B. challenges    C. challenging     D. to challenge

     

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    Life is full of _______.School is thought as the most ­­­_______ obstacle(障碍) in the lives of youth today.

    A．challenge; challenging                   B．challenges; challenged

    C．challenges; challenging                   D．challenging; challenges

     

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