A horse is ( ) useful animal.A.an B.a C.the D.this
A horse is a useful animal和The horse is a useful animal
___ elephant is ___ useful animal.A.An;an B.An;a C.Thn;an D.
an eiephant is-useful animal的横线应填什么?A.a B.an C.the D./
This is a ( ) useful advice A a B an C the D 应选哪一个
This is ______ useful book. A. a B. an C. the D/
This is ___ useful dictionary .选择:A.an B.a C.the D./
a horse is an animal
an useful animal?还是a useful animal?
The elephant is _____ useful animal to human beings.A.a B.an
改错:A fox is an useful animal.
horses are useful animals/ a horse is a useful animal.马是有用的动
单项选择:A horse is_____useful animal.A.an B.a C.the说明选择的原因,谢谢为什