单项选择题

The book took ten years of thorough research.

A. basic
B. social
C. major
D. careful
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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
Things have changed a lot since I was a child.
A. gradually
B. suddenly
C. greatly
D. frequently
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