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    22．At last they had to give up.for they found difficult to finish so much work in such a shot period of time． A．that B．this C．so D．it 【查看更多】

     

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    At last they had to give up，for they found ____ difficult to finish so much work in such a  shot period of time．

    A．that               B．this              C．so                 D．it

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