◎ 题干
All the drivers must be careful when they are driving to prevent the traffic accident _____.
[     ]
A. happen
B. to happen
C. from being happened
D. from happening
◎ 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“All the drivers must be careful when they are driving to prevent the traffic accident _____. [ ]A. happen B. to happenC. from being happened D. from happeni…”主要考查了你对  【实义动词】【动词短语】  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。