问题
选择题
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
答案
答案：A
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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
答案：A