◎ 题干
Hangzhou Metro Line 1,         into use in 2012, is expected to relieve the heavy traffic in this city.
[     ]
A. to be put            
B. being put          
C. having put          
D. put
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Hangzhou Metro Line 1, into use in 2012, is expected to relieve the heavy traffic in this city.[ ]A. to be putB. being putC. having put D. put…”主要考查了你对  【不定式的被动式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。