冠词练习中的问题This is ___an____ apple.It's ___a___ big apple后一句It'

This is( )apple.It's（ ）big apple填空 Is it _______ orange?No,it s ________ big apple What（ )this?It's( )apple This red apple is big.It is _big apple.a.an b.a c.\ This is a apple.It's red错在哪里 Is that apple big?请选择：A.Yes.it's.B.No,it's small apple.C.No, It is （ ） apple.( )apple is red. what's this?it's an apple. it's a green apple. It's a big apple这句话对不对 Peter has the red apple.It is big.对不对 What's this in English?It's ______ apple. What's this?________ a red apple.A.This is B.It's C.It D.Thi