问题
选择题
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
答案
答案：C
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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
答案：C