单项选择题

The book took ten years of thorough research.()

A．basic
B．careful
C．social
D．major

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单项选择题
Greene spent a brief time at Cambridge.()

A．short
B．hard
C．good
D．long
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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