◎ 题干
——Why couldn’t they catch the 6:30 train ?
——Because they were delayed by          .
A.some heavy traffics B.heavy traffic
C.a heavy traffic D.any heavy traffic
◎ 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“——Why couldn’t they catch the 6:30 train ? ——Because they were delayed by .A.some heavy traffics B.heavy traffic C.a heavy traffic D.any heavy traffic…”主要考查了你对  【单词、词组】  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。