Every possible means ______, but none proves successful. A. has tried B. have been tried C. is being...
2022-11-08 09:45:11 27次 2014-2015学年陕西宝鸡中学高三上期中（A卷）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：
Every possible means ______, but none proves successful.
A. has tried B. have been tried
C. is being tried D. has been tried
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