Chengdu Metro Line 1,______ into use in October 2010,has mad

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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

首先,分析题干,两个逗号之间的东西起说明作用,此处修饰Chengdu Metro Line 1；
其次,分析选项,由于has made 已经做了谓语,如果没有从句,一句话不会出现两个谓语,B选项应该首先排除；
再次,从语态和时态分析,语态应该是Line被使用,可以排除C,从时态是Oct. 2010当然是过去时,排除A to be put.
此类选择题做法都如上,从语态时态一起判断
此类选择可以从选项中观察出在考时态语态

一道英语单选题Subway Line 4,＿into use in 2009 has made travelling i 英语翻译The No.5 subway line,opened in October,07,has greatly im cut in(还是into) the line in october 2003 shenzhou V flew into space 对in october 2003 use before October 1、Mid-autumn Day usually ______ in September or October ever She was born in Chongqing,but Chengdu has become her second( Can you use a straight line turn these three ten into "nine 连词成句 October ,has ,who ,in ,a ,birthday 句型转换What's the weather like in Chengdu?（写出同义句）_______ ______ 关于cut in the line与cut into the line 的差别英语翻译1,Fish has sense organs in a canal as the lateral line,w