单项选择题

A traffic accident（）yesterday afternoon. A bus ran into a train.

A．occur
B．arose
C．happened
D．break out

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单项选择题

He was very tired and could hardly stand up, let alone （）.

A．to walk
B．walk
C．walking
D．walked fast

单项选择题

The number of people in our company（）every year.

A．rise
B．raise
C．rises
D．are raised

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