单项选择题

The new policy may have protected the new city from being polluted as well as the life of its residents ______.

A．affected
B．affecting
C．is affected
D．having affected
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单项选择题
After the Vietnam War, the image of the United States, especially its armed forces, was ______.
A．disfigured
B．disappointed
C．disfavored
D．discredited
单项选择题
The company purchased several computers programmed to ______ the specific tasks required.
A．tackle
B．solve
C．assign
D．follow
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