◎ 题干
The girl was singing when her teacher ______ into the classroom.
[     ]
A. came
B. was coming
C. is coming
D. comes
◎ 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“The girl was singing when her teacher ______ into the classroom. [ ]A. cameB. was comingC. is comingD. comes…”主要考查了你对  【实义动词的过去式】  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。