◎ 题干
— Why on earth didn't you answer the phone?    
— I'm terribly sorry, but the doorbell _____, too.
[     ]
A. is ringing
B. rang
C. was ringing
D. has rung
◎ 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 on earth didn't you answer the phone? — I'm terribly sorry, but the doorbell _____, too. [ ]A. is ringingB. rangC. was ringingD. has rung…”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。