◎ 题干
The earthquake _____ when I _____ some cleaning.        
[     ]
A. starts, was doing          
B. started, was doing  
C. was starting, was doing    
D. starts, were doing
◎ 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“The earthquake _____ when I _____ some cleaning.[]A. starts, was doingB. started, was doing C. was starting, was doing D. starts, were doing…”主要考查了你对  【一般过去时】【过去进行时】  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。