◎ 题干
When the teacher came in, all the students pretended_____________their homework.
[    ]

A. to do  
B. doing
C. to be doing  
D. done

◎ 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“When the teacher came in, all the students pretended_____________their homework.[ ]A. to doB. doingC. to be doingD. done…”主要考查了你对  【不定式的进行式】  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。