He saw three ____ in the field.

He saw three ____ in the field.
A、goose
B、fox
C、mouse
D、sheep
【正确答案】:D
【题目解析】:goose 天鹅;fox 狐狸;mouse 老鼠;sheep 羊;根据three 可知此处为复数,因此选D,sheep 单复数同形。