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        1. Drivers are warned___________when they are tired.
          A.to driveB.not driveC.not to driveD.not driving
          C
          本題考查動(dòng)詞用法。warn sb not to do sth,表示警告某人不要做某事。句意:司機(jī)被警告當(dāng)他們勞累的時(shí)候不要開(kāi)車(chē)。
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