People less tolerant of smoking in public places these days.A. becomeB. have becomeC. will

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A. bee
B. have bee
C. will bee
(答案→)D. are being
解析：这句的时间点是these days. 而这里用进行时表示正在逐步变得，这种变化是正在进行的，句意是：人们现在逐渐变得不能忍受在公共场合抽烟了。选D。