He has ___D_ on his farm.

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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

the farmer has more than 500 _h____ on his farm He was raised by his grandmother on a farm.为什么是on a farm? has he _____(arrive)at the farm on time he had some chicken on his farm.同义句 He has__________on his farm. 英语翻译Qld MacDonald had a farm,E_l_E_l-O.and on his farm he ha Mr.Smith has many pigs on his farm.为什么要用on这个介词? 英语翻译An old farmer was on his farm all his life.One day,he vi 英语句子改错He has worked on this farm for two years when he was a what do you eat he has 100 sheep on the farm what dose he ha 11.He had to help his parents ___ on the farm on weekends.A. The farmer has some ducks on his farm.(改为一般疑问句）( ) the farme