In boxing, players should wear gloves and mouth guards ________ anything dangerous happens. A.in vai...
2022-05-06 08:28:19 95次 北京市延庆区2019-2020学年高一下学期期中考试英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
In boxing, players should wear gloves and mouth guards ________ anything dangerous happens.
A.in vain B.in a word C.in debt D.in case
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