题目内容
30. 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
A

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30. 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 |