He has ___D_ on his farm.

问题描述:

He has ___D_ on his farm.
A.20 head of cattles B.20 heads of cattles.
C.20 heads of cattle D.20 head of cattle.
请高手讲下,这个题为什么要选D而不选B呢,我有点不懂,请讲的详细点,我将感激不尽!

一些词可数还是不可数要看使用场合,head作为脑袋来讲是可数的,但是根据剑桥国际英语词典,They own a hundred head of cattle.(U)这种情况下是不可数的.U就是uncountable(不可数).你也可以说100 cattle.
cattle是复数名词,不加s