◎ 题干
— Why couldn't they meet us at five o'clock?
— Because they were delayed by ______.

A. heavy traffic
B. heavy traffics
C. crowded traffic
D. crowded traffics
◎ 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“— Why couldn't they meet us at five o'clock? — Because they were delayed by ______.[ ]A. heavy trafficB. heavy traffics C. crowded traffic D. crowded tra…”主要考查了你对  【不可数名词】【形容词】  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。