问题描述：
英语作业（猜谜语）
It is not in a house .
It is not outside a house.
It is part of a house.
what is it?
There is a duck in front of two ducks.
There is a duck between two ducks.
There is a duck behind two ducks.
How many ducks are there at least?
It is not in a house .
It is not outside a house.
It is part of a house.
what is it?
There is a duck in front of two ducks.
There is a duck between two ducks.
There is a duck behind two ducks.
How many ducks are there at least?
问题解答：
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