单项选择题

We explored the possibility of expansion at the conference.（）

A. offered
B. included
C. accepted
D. investigated

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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
The police believe the motive for the murder was jealousy.（）

A. choice
B. idea
C. decision
D. reason
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