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问题: 高一英语选择题

A group of _____ are eating _____ and _______ at the foot of the hill.
A.sheep;grass;leaves B. sheeps;grasses;leaves C. sheep;grass;leaf D. sheeps;grass;leafs

请教选与不选的原因.谢谢!

解答:

选 A
b grass 是不可数名词,不能加 s
c sheep 的单复数同形,不能加 s
d leaf 的复数是 leaves