本单元在what's this in English It's 句型中,前面需要a的单词是 前面需要用an的

本单元在what's this in English It's 句型中,前面需要a的单词是 前面需要用an的 It‘s an English book.（前面的问句） 1.What's this/that in English?怎样回答?是It's a/an 名词 还是 It's 名词 单复数句型转换It is a bag.Is that an eraser?What's this in English? 51.–What’s this in English?-- It’s an a english . What's this in English? It's an orange. What's this in English?it's an IC c____. What's this in English?A.Orange B.An orange C.It's orange D. what's this in english .It's a ruler What's this in English?It's a(n) What's this in English?It'( )apple.A.an.B.a.C.不填 选哪个? What`s this in E( ) It`s an a ( )