◎ 题干
This morning traffic was ________ by an accident outside the town hall.
[     ]
A. held off  
B. held up
C. held on  
D. held over
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“This morning traffic was ________ by an accident outside the town hall.[ ] A. held offB. held upC. held onD. held over…”主要考查了你对  【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。