◎ 题干
You could hear water pipes cracking _____ they _____ because of the cold.
[     ]
A. when; burst  
B. before; were burst  
C. when; were burst  
D. before; burst
◎ 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“You could hear water pipes cracking _____ they _____ because of the cold. [ ]A. when; burstB. before; were burst C. when; were burstD. before; burst …”主要考查了你对  【从属连词】【一般过去时】  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。