单项选择题

The high-speed trains can have a major impact on our lives.

A．effort
B．problem
C．concern
D．influence
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单项选择题
His shoes were shined to perfection.
A．cleared
B．washed
C．polished
D．mended
单项选择题
A number of the theories have been proposed to explain the situation.（）

A．suggested
B．tested
C．used
D．announced
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