单项选择题

The book took ten years of thorough research.（）

A. basic
B. careful
C. social
D. major

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单项选择题
The test produced disappointing results.（）

A. unsatisfactory
B. indirect
C. similar
D. positive
单项选择题
My doctor said I should vary my diet more.（）

A. change
B. prepare
C. cook
D. choose
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