30. The No. 5 subway line, in October, 2007, has greatly improved the traffic conditions i

发布时间：2020-08-16 06:20:36


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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(答案→)A. opened
B. was opened
C. being opened
D. to be opened
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