It’ll be another 50 years _________ China is expected to reach the level of a medium developed count...
2022-11-02 10:12:15 29次 2014-2015学年陕西西工大附中高三下模拟考一英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It’ll be another 50 years _________ China is expected to reach the level of a medium developed country.
A. since B. before C. that D. when
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