◎ 题干
Jim _____ on the computer when his father returned home.

[      ]

A. works
B. worked
C. was working
D. is working
◎ 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“Jim _____ on the computer when his father returned home. [ ]A. works B. worked C. was working D. is working …”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。