Chengdu Metro Line 1,______ into use in October 2010,has made the traffic in this city not so busy.A.to be put B.be put C.having put D.put为什么不选B?被投入使用

Chengdu Metro Line 1,______ into use in October 2010,has made the traffic in this city not so busy.A.to be put B.be put C.having put D.put为什么不选B?被投入使用 METRO LINE 9怎么样 metro 翻译:You can take Metro Line 2 and transfer to Metro Line 7 at Jing'an Temple.中译英,如题. metro-stadium metro是什么意思 METRO怎么样 英语翻译翻译这句话：Transportation wise,it's easy to get to either walking of via the metro line which is a few blocks away. Line 3 of the Nanjing metro will be in use in2014A.how excited the news isB.what an excited news选哪个, phase在一句话中的意思The five new subway lines - Fangshan Line,Changping Line,the first phase of the No 15 Line,Yizhuang Line and Daxing Line - have a combined length of 108 kilometers,bringing the city's total metro length to 336 km and the 英语翻译Metro Signaling and Modern Railway Signaling Signaling used on high density metro (or subway) routes is based on the same principles as main line signaling.The line is divided into blocks and each block is protected by a signal but,for me line 1 without def line line line LINE metro的意思 metro有哪些好处?