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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