皮皮学，免费搜题
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【单选题】
Gestern war Sonntag. Ich habe nicht ____.
A.
gearbeiten
B.
arbeiten
C.
gearbeit
D.
gearbeitet
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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规律可以为人所认识
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【单选题】As shown in figure, a fixed amount of ideal gas changes from equilibrium state A to B (Pa=Pb). Which of the following statement is true?【图片】
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B.
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A.
规律可以为人所认识
B.
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【简答题】Many large building which are used for storing goods need clean air and controlled tempreture. This can be expensive. because it uses a lot of energy.1)_________________ save costs, some companies ar...
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