单项选择题

______their service, many taxi drivers in Shanghai are going to learn everyday English.

A．Improving
B．Having improved
C．Improved
D．To improve
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单项选择题
Some 25,000 people were reported______in the ever recorded worst earthquake in Iran, which occurred late this month.
A．were killed
B．to be killed
C．killing
D．to have been killed
单项选择题
______are the Olympic Games held They______once every four years.
A．How soon; occur
B．How long; are held
C．How often; occur
D．How far; are held
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