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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单项选择题
The police believe the motive for the murder was jealousy.（）

A. choice
B. idea
C. decision
D. reason
单项选择题
Marsha confessed that she knew nothing of computer.（）

A. admitted
B. reported
C. hoped
D. answered
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