How can you expect him to make any improvement ________you never give him an opportunity to have a t...
2022-11-07 18:06:24 161次 2014-2015学年江苏省高三上期中英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
How can you expect him to make any improvement ________you never give him an opportunity to have a try?
A. unless B. when C. until D. while
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