There is ________"s'' in the word "sun''(a,an)

There is ________"s'' in the word "sun''(a,an) 单项选择1.There is ( ) "s" and ( ) "u" in the word "sun".A.a.an there is___"s"in the word"sun".a.a b.an c.the d./ There is____ s and _____ u in the word sun 为什么选an...a... Look! There is ________ “a” in the word “chair”. A. a B. an Look!There is ________ “a” in the word “chair”.A.a B.an C.\ There is ( ) "s" and ( ) "u" in the word house.A.a;a B.a;an there is（ ）“s"and( )"t"in the word "sit'' A.a an B.an a C.an 用a,an填空 There is __"u" ___ "s" and ___ "e"in the word There is ____ s and ___u in the word 填a还是an? there is () u and ()s in the word “us” 填写a和an There is ( )"u"and( )"s"in the word"use"?答案是a和an,