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    21、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

    21、B

    解析：本题考查时态和语态，首先我们要判断时态。意思是在最近恐怖活动的这段时间里，人们一直被提醒不要去碰那么丢弃的包。所以，表达的是在一段时间里一直做某事，完成时可以表达这个含义，或者是进行时和一段时间联用也可以表达这个含义。有的同学可能会选择A，但是我们没法确定用过去完成时，因为过去完成时是不能单独使用的。应该是现在完成时。但是没有，所以我们只有选择B。

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