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
A number of theories have been proposed to explain the situation.
A. suggested
B. tested
C. used
D. announced
单项选择题
We explored the possibility of expansion at the conference.
A. offered
B. investigated
C. included
D. accepted
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