单项选择题
A. Are you kidding B. Pardon C. I can't agree more. D. Why not
The No. 5 subway line, ()in October, 2007, has greatly ...
单项选择题The No. 5 subway line, ()in October, 2007, has greatly improved the traffic conditions in Beijing.
A. opened B. was opened C. being opened D. to be opened