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1.保持教室干净是keep the classroom quiet还是keep quiet in the classro

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1.保持教室干净是keep the classroom quiet还是keep quiet in the classroom.
2.做晚饭是make dinner还是cook dinner
3.night的介词是at,可为什么school night(上学日的晚上)的介词是on?
1.保持教室干净是keep the classroom quiet还是keep quiet in the classro
1)用keep quiet in the classroom,而keep the classroom quiet使教室安静,教室自身怎么能安静?keep the classroom clean倒可以,所以一般不这样用.
2)两者都可以,你可以在百度上找到相应的例句.
3)night前面本来就既可以用on,又可以用at,区别是at night只能表达某一个晚上,而on night泛指夜晚(也就是复数)