单项选择题

团体餐服务时冷菜可以在开餐前()摆放于餐台上。

A.5分钟
B.30分钟
C.20分钟
D.10分钟
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____________, I found all the seats were taken.
A、To enter the classroom
B、Entered the classroom
C、Entering the classroom
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The machinery enjoys high popularity in all industries for it ________ functions.
A.ineffective
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C.affective
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