题目

During the period of recent terrorist activities, people ____ not to touch any unattended bag. A. had always been warned  B. were always being warned  C. are always warning  D. always warned   答案： B 句意: 在最近恐怖活动期间, 人们总是在被警告不要碰任何无人照看的包。be always doing sth.总是做某事, 表达某种抱怨、不满或赞许的情绪。人们是“被警告”, 要用被动语态。  

查看本题答案和解析