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问题: 先选择然后说为什么:

先选择然后说为什么:
----How long have you lived here?
----I lived here for _______.
A.a half and six years
B.six and a half year
C.six year and a half
D.six and a half years

解答:

选D

首先,要明确"a half和six"是用来修饰year的,也就是说year用单服数,看前面half和six的。

其次,明确一下six和a half到底应该如何组合
one and a half
two and a half
............
six and a half
这就是用法,

最后,这种用法,所修饰的名词用复数形式。

所以用six and a half years,选D

P.S.如果你要查对应的语法书,可以看看”主谓一致“这部分。