单项选择题

A number of theor.ies 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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