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A
A.He did not realize the importance of the social practice unless he was graduated from the university.
B
B.Not until did he graduated from the university he did not realize the importance of the social practice.
C
C.Not until he graduated from the university did he realize the importance of the social practice.
D
D.It was not until he graduated from the university that did he realize the importance of the social practice.
正确答案 ：C
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