◎ 题干
At that time we lived in houses which _______ old, cold and unsafe.  
[     ]
A. are          
B. were          
C. is              
D. was
◎ 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“At that time we lived in houses which _______ old, cold and unsafe.[ ]A. are B. wereC. isD. was…”主要考查了你对  【一般过去时】【主谓一致】  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。