单项选择题

Greene spent a brief time at Cambridge.（）

A. hard
B. good
C. short
D. long

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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

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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