people are willing to pay more for_organic food which is of_great benefit to our health and the enviroment
问题描述：
people are willing to pay more for_organic food which is of_great benefit to our health and the enviroment
A.the;a B.the;/ C./;/ D./;a
选C为什么?
答
这里food为不可数名词,所以不加定冠词；be of great benefit：对.及其有益的,不加不定冠词a