单项选择题

A number of theories have been proposed to explain the situation（）

A．tested
B．suggested
C．used
D．announced

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单项选择题
My doctor said I should vary my diet more
A．prepare
B．cook
C．change
D．choose
单项选择题
We explored the possibility of expansion at the conference（）

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