◎ 题干
Bob________after his classmate in the classroom when his teacher________.
[     ]
A.ran;turned up  
B.was running;turned up
C.was running;would turn up
D.had run;would turn up
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Bob________after his classmate in the classroom when his teacher________.[ ]A.ran;turned upB.was running;turned upC.was running;would turn up D.had run;woul…”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。