◎ 题干
It is every citizen's duty to go out to ______ the snow on the street______ it stops falling so as to make it convenient for traffic to pass.
[     ]
A. sweep up; the instant    
B. clear up; the moment  
C. clean up; immediately  
D. whirled up; directly
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“It is every citizen's duty to go out to ______ the snow on the street______ it stops falling so as to make it convenient for traffic to pass. [ ]A. sweep up;…”主要考查了你对  【动词短语】【状语从句】  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。