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during the period of recent terrorist activities,people____n

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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 为什么选B,可以解析一下吗,谢谢
during the period of recent terrorist activities,people____n
翻译：在近期的恐怖袭击活动期间,人们被警告不要去触碰任何无主的包裹.
解释：从句意来看,句子主语people和warn之间明显是被动语态,排除D；从句子的时间状语（during the period of recent terrorist activities）尤其是recent来看,选项动作必定发生在过去,排除C；A为过去完成时,要求句中比如有一个发生在其后的过去动作或时刻,但是全句不存在这种明显的先后对比,排除A.
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