单项选择题

A．He is always early for work.
B．He is never late for work.
C．He is usually on time.
D．He is often late for work.
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单项选择题
Most people in the United States buy insurance_________.
A．to pay for their own medical care
B．to help to live on their low incomes
C．to improve the national health care service
D．to solve one of the important political problems
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