单项选择题

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

A. effort
B. problem
C. influence
D. concern
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单项选择题
She can be relied on in a crisis.
A. depended on
B. looked after
C. believed in
D. turned on
单项选择题
The book took ten years of thorough research.
A. basic
B. social
C. major
D. careful
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