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 解析:考查时态和语态的用法.根据时间状语可知是指过去.be always doing sth.表示一种感情色彩.并且人们与警告之间是被动的关系.所以答案为B. 答案:B 【查看更多】
