in a day or two与in one day or two的区别?"He will be back in a day or two"为什么不能说"He will be back in one day or two"?

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• a long time ago,two friends lived in a palace and worked for the king.one of these boys _1_ a girl very much and he wanted to give her a present.one afternoon,he and his friend _2_a big vase with some beautiful flowers in it.he _3_up and took one for the girl.the next day he did the _4_thing,and the third day,and the fourth day...until the morning of the ninth day.the king noticed very _5_flowers were left in the vase.he was so angry that he called _6
• 高一完形填空 Andy was born with a developmental disorder.The two sides of his brain were not__1__Andy was born with a developmental disorder.The two sides of his brain were not__1__normally together.The right side of his__2__could not communicate with the left.At the age of three,it was__3__for him to walk,speak,and play.He could only echo back a few words,and walked__4__while someone held each of his hands.Then came the__5__.He attended an all-day center w
• .a man has two different feet,one is big,the other is small,He can't buy suitable shoes.One day ,his friend told him to
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• 英语首字母填空 完形填空.One day,two brothers 1 fishing.They had a dog 2 them.When they came near the river,they took 3 their hats on a big stone and went to the river’s bank to look 4 fish.It was cold that day,and soon they began to feel cold and wanted their hats.They told the dog5 back for them.When the dog 6 there,it tried to take both hats together in its mouth at once,but it was hard for it.Then the dog saw that one of the hats was7 Than the other.It put th
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• he has to wait a long time f_ a train going back
• i hear he will come in_ a .a day or two b.one day or two c.one and two days d.one day or two days为什么不选b?