Today, when scientists examine mummies, they wear special clothing for protection _____ they breathe...
2022-10-29 18:19:02 63次 2014-2015学年湖南衡阳第八中学高一下期末英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Today, when scientists examine mummies, they wear special clothing for protection _____ they breathe in harmful gas.
A. even though B. in case C. until D. unless
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