急需要帮助，看看词语法

Spencer125

For the farmer who takes care to keep them cool, providing them with high-energy feed, and milking them regularly, Holstein cows are producing an average of 2,275 gallons of milk each per year.

A.    providing them with high-energy feed, and milking them regularly, Holstein cows are producing
B.    providing them with high-energy feed, and milked regularly, the Holstein cow produces
C.    provided with high-energy feed, and milking them regularly, Holstein cows are producing
D.    provided with high-energy feed, and milked regularly, the Holstein cow produces
E.    provided with high-energy feed, and milked regularly, Holstein cows will produce
答案是E，为何不是D。现在时代为何不对？？？

摇曳的叶子

them
the Holstein cow

Spencer125

摇曳的叶子 发表于 2013-9-2 22:14
them
the Holstein cow

饿，我无语了。。。。。。

448258130

其实沙发的意思很清晰明了了

For the farmer who takes care to keep them cool中them需要指代
而the Holstein cow 是单数，无法指代