皮皮学，免费搜题
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【单选题】
境内旅游,旅行社在出发前2日通知旅游者中止旅游的,旅游者全额退还预付旅游费用,并支付旅游费用总额()的违约金。
A.
10%
B.
15%
C.
20%
D.
25%
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【单选题】Tom along with his classmates ______ for the coming exam. [    ]
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【单选题】She is very busy ____for a journey. A. to prepare B. preparing C. to be preparing D. being prepared
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【单选题】Father is us a meal . We may wash our hands and the meal.
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preparing
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A.
系统的概念模型
B.
系统的逻辑模型
C.
系统的物理模型
D.
可行性模型
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【单选题】Tom along with his classmates ______ for the coming exam. [    ]
A.
are preparing
B.
are preparing themselves
C.
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