单项选择题

Things have changed a lot since I was a child（）

A．graduatly
B．suddenly
C．frequently
D．greatly

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单项选择题
They converted the spare bedroom into an office.（）

A．reduced
B．turned
C．moved
D．reformed
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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