Passengers ________ keep alert(警惕的) when we are offered the car－hailing service(网约车服务)． A. are allow...
2022-10-15 11:44:39 119次 2018年秋人教版九年级英语下册（山西）习题：Unit14 5第四课时 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Passengers ________ keep alert(警惕的) when we are offered the car－hailing service(网约车服务)．
A. are allowed to B. are supposed to
C. are not supposed to
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