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    精英家教网 > 高中英语 > 题目详情
    Chengdu Metro Line l, _____ into use in October 2010, has made the traffic in this city not so busy.

    A. to be put
    B. being put
    C. having put
    D. put
    D
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    科目：高中英语 来源：四川省模拟题 题型：单选题

    Chengdu Metro Line l, _____ into use in October 2010, has made the traffic in this city not so busy.
    [     ]
    A. to be put
    B. being put
    C. having put
    D. put

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