◎ 题干
— Why didn't you answer the phone?
— I'm terribly sorry,  but the doorbell________,  too.
[     ]
A. is ringing  
B. rang
C. was ringing  
D. was about to ring
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“— Why didn't you answer the phone?— I'm terribly sorry,but the doorbell________,too.[ ]A. is ringingB. rangC. was ringingD. was about to ring…”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。