2. 专升本
  3. The No. 5 subway line, ___in October, 2007, has greatly improved the traffic conditions in Beijing.

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

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问题 The No. 5 subway line, ___in October, 2007, has greatly improved the traffic conditions in Beijing.
选项 A、opened
B、was opened
C、being opened
D、to be opened
答案A
解析
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