請(qǐng)教一道GMAT語(yǔ)法題,實(shí)在是看不懂~
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
為什么一開(kāi)始要說(shuō)for the farmer...這個(gè)句子的主語(yǔ)卻是cows.還有,為什么A不對(duì).