You are not allowed to take a bus _________ you wear a mask (口罩). A.unless B.when C.if D.because
2022-05-15 10:04:21 174次 2020年上海市金山区中考二模英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
You are not allowed to take a bus _________ you wear a mask (口罩).
A.unless B.when C.if D.because
本题链接：
