◎ 题干
You mustn't _______ them everywhere _______ you use plastic bags.
[     ]
A. fall; until
B. fall; before
C. drop; while
D. drop; after
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“You mustn't _______ them everywhere _______ you use plastic bags. [ ]A. fall; until B. fall; before C. drop; while D. drop; after …”主要考查了你对  【实义动词】【从属连词】  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。