20、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
20、D
科目：高中英語 來源： 題型：
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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