There were two houses _______ the trees and _______ the two

正确答案：选C.among,between
即：There were two houses among the trees and between two houses there was a farm.
翻译：在一些树之间有两个房子,而在两个房子之间有一个农场.
解析：在两者之间用between,在三者或三者以上之间用among.一般情况下树都是很多的,不可能就只有两棵树,所以在树之间应该用among.
另外注意：
1.between 也可以用于多个事物中的两者之间,如
There are some flags between two trees.
每两棵树之间都有一面旗子.
2.当and连接三者或三者以上的人(物)而仍然强调两者的并列时,常用between.如：
The hospital lies between a river and hills．
医院坐落在一条河与群山之间.
The park lies between a road and the woods．
公园位于一条马路与树林之间.
有不明白的请继续追问,

D. between; between
有2个房子在树林和这2个房子之间有一个农场

你好！
正确答案为：
C
三者及以上之间用among

两者之间用between.
大树之间有两个房子，两个树之间有块地。

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C，among是介于多者之间的，between是介于二者之间的