There is （an） "s" in word "sun".解释这句话的意思和括号里为什么填“an"?

There is （an） "s" in word "sun".解释这句话的意思和括号里为什么填“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 and _____ u in the word sun 为什么选an...a... There is an "s" in the word "bus".为什么用an 填空：You're dropped ( )"s" in the word "necessary"括号里填 a 还是 an There is ____ s and ___u in the word 填a还是an? There is---- "s" in the word "snake"?请问横线上填a还是an there is（ ）“s"and( )"t"in the word "sit'' A.a an B.an a C.an There is an s and a u in this word.为什么对呢 there is___"s"in the word"sun".a.a b.an c.the d./ there is () u and ()s in the word “us” 填写a和an