【题目】Our country has launched a campaign to ban smoking in public places, which with some heavy smokers.
A. concerns B. was concerned
C. concerned D. is concerned
在线课程【答案】D
【解析】D考查时态。句意：我们的国家已经发起了一项禁止在公共场所吸烟的运动，这与一些烟瘾很大的人有关。短语be concerned with“与…有关”，主句用了现在完成时态，which定语从句用一般现在时态，故选D。