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英语介词小问题1.You should hand in your homework ______five o'clock

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英语介词小问题
1.You should hand in your homework ______five o'clock this afternoon.
2.Look,there are many birds sitting _______the tree.
3.The doctor worked _____five hours in his office without a rest.
额(⊙o⊙)…都不一样!为什么???
1.at
2.in
3.for
1.固定的,在几点钟用介词at
2.鸟在树里,用in.苹果在树上,用on
3.工作了五个小时,固定的fo