选A what a fat sheep !
sheep是可数名词,只是它的单数和复数形式是一样的,请看下面的句子：The man looks after about eighty sheep.这人放牧八十来只羊.He is a black sheep in the family.他是他家的败家子.可是答案选B啊what ______! How did you raise it!( It) 是它，单数。所以前面要用单数。