单项选择题

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

A. gradually
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 theories have been proposed to explain the situation.（）

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