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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单项选择题

His long-term goal is to set up his own business.（）

A. idea
B. energy
C. aim
D. order

单项选择题

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

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

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