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During the period of recent terrorist a...

 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

 

 B 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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