“三宝”、“四口”中的四口是指（）
A、预留洞
B、阳台口
C、通道
D、电梯井口
E、楼梯口
参考答案：A, C, D, E
—______ have you kept the book from Jim?
— For several days. [ ]
A. How many
B. How much
C. How long
D. How often
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