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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科目：高中英語 來源：四川省模擬題 題型：單選題

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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