题目内容
During the period of recent terrorist activities, people _____ not to touch and unattended bag.
A. had always been warned B. were always being warned
C. are always warning D. always warned
【答案】
B。
【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.能表示一种感情色彩,并且人们与警告之间是被动的关系,所以答案为:B。

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