◎ 题干
-Must we keep the window __________ all the time?
-No, you don't have to.
[     ]
A. opening
B. opened
C. to open
D. open
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“-Must we keep the window __________ all the time?-No, you don't have to.[ ]A. openingB. openedC. to openD. open…”主要考查了你对  【实义动词】  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。