求分析：People__by PM2.5,so they realized the importance of prot
求分析：People__by PM2.5,so they realized the importance of protecting the
environment.A.warned B.are warned C.has been warned D.were warned
environment.A.warned B.are warned C.has been warned D.were warned
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d原因,因为下文用连词so连接,可见两个句子时态一模一样.而c答案中has不对,a答案中,由于warn是及物动词,也不对,b答案时态不对,故选择d
1年前
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