Humans never know what progress they can make until they _______ very hard. A. tried B. will try C. ...
2022-09-27 22:13:18 21次 江苏省2019届九年级3月月考英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Humans never know what progress they can make until they _______ very hard.
A. tried B. will try C. is trying D. have tried
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