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

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You shouldyour stupid ideas, otherwise you'll regret in the future.()

A. put down
B. put away
C. put aside
D. put out
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The national Education Department says school safety has set off alarm bells with frequent serious accidents ()injured or even killed.

A. that
B. in which
C. by which
D. when
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