A sheep on this kind of special grass which usually grows much faster than on ordinary. A.

A sheep on this kind of special grass which usually grows much faster than
on ordinary.
A. fed; one
B. feeds; the one
C. fed; that
D. feeding; it

(答案→)A. fed; oneB. feeds; the oneC. fed; thatD. feeding; it解析：用过去分词修饰A sheep表示被动，one代替前面的单数名词a sheep。

好好学习下