◎ 题干
The mail was _____ for two days because of the snow storm.
[     ]
A. held out           
B. held off
C. held up            
D. held down
◎ 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“The mail was _____ for two days because of the snow storm. [ ]A. held out B. held off C. held upD. held down …”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。