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
Marsha confessed that she knew nothing of computer.
A．reported
B．admitted
C．hoped
D．answered
单项选择题
The book took ten years of thorough research
A．basic
B．social
C．careful
D．major
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