◎ 题干
—How did the accident happen?
—You know, it was difficult to see the road clearly because it       .
[     ]
A. is raining        
B. rains  
C. was raining            
D. has rained
◎ 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“—How did the accident happen? —You know, it was difficult to see the road clearly because it . [ ]A. is rainingB. rains C. was rainingD. has rained…”主要考查了你对  【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。