单项选择题

The project required ten years of diligent research.

A. hardworking
B. social
C. basic
D. scientific
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单项选择题
Our arrangements were thrown into complete turmoil.
A. doubt
B. relief
C. failure
D. confusion
单项选择题
I want to provide my boys with a decent education.
A. special
B. private
C. general
D. good
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