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    精英家教网 > 高中英语 > 题目详情
    The procedures(程序) of operating a computer have been ______ several times, the results
    of which have made it much easier _______.   
    [     ]
    A. cut down; to operate              
    B. simplified; to be operated  
    C. reduced; to be operated            
    D. simplified; to operate
    D
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