单项选择题

Greene spent a brief time at Cambridge.

A. short
B. hard
C. good
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. concern
D. influence
单项选择题
A number of theories have been proposed to explain the situation.
A. suggested
B. tested
C. used
D. announced
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