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 |
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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 |