The new examination system has to be _______ in special regions before it can be applied nationwide.

题目简介

The new examination system has to be _______ in special regions before it can be applied nationwide.

题目详情

The new examination system has to be _______ in special regions before it can be applied nationwide.    
[     ]
A. put out    
B. experimented out      
C. tried out    
D. taken out
题型:单选题难度:偏易来源:同步题

答案

C

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