( )elephant is ( )useful animal to p

( )elephant is ( )useful animal to p ------ elephant is ----- useful animal to human beings.填神马? The elephant is _____ useful animal to human beings.A.a B.an ___ elephant is ___ useful animal.A.An;an B.An;a C.Thn;an D. ( )horse is ( )useful animal. 英语作文：my favourite animal is elephant. 改错：A fox is an useful animal. ______(Dog)dog is ______ useful animal. 1.The dog is a useful animal. 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 my favorite animal is the elephant写同义句