问题描述：
___did the students realize they are wrong.
A.It was until B.It was not until then C.Not until then D.Not until
这题为什么要选C,选B不对吗?
A.It was until B.It was not until then C.Not until then D.Not until
这题为什么要选C,选B不对吗?
问题解答：
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