◎ 题干
Drivers are warned___________when they are tired.
A.to drive B.not drive C.not to drive D.not driving
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Drivers are warned___________when they are tired.A.to driveB.not driveC.not to driveD.not driving…”主要考查了你对  【不定式】【分词】【动名词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。