由备选项可知句意为,人们总是被警告
首先确定为被动句,排除D
A为过去完成时的被动语态,强调过去的过去,而题中During the period 只是强调过去发生的一件事,所以排除
最后还是由During the period 确定为过去式,推出B
C,B的句型：be always doing 带有强烈的感情色彩,有“常常,总是”的意思
一个时态单选题During the period of recent terrorist activities,peop
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