an useful animal?还是a useful animal?
an useful animal?还是a useful animal?
改错:A fox is an useful animal.
为什么useful前有时用a(a useful book),有时用an(an useful animal)啊
( )horse is ( )useful animal.
1.The dog is a useful animal.
an animal还是a animal
___ elephant is ___ useful animal.A.An;an B.An;a C.Thn;an D.
A horse is a useful animal和The horse is a useful animal
The hourse is a useful animal.Horses are useful animal都是马是有用
The elephant is _____ useful animal to human beings.A.a B.an
什么时候加an,什么时候加a?__ university __ useful animal __ eight-legge
an animal doctor还是a animal doctor