Do you have (an) HB pencil?括号里为什么填的是an,而不是a?

Do you have (an) HB pencil?括号里为什么填的是an,而不是a? do you have an orange Do you have an clock? Do you have an e Do you have an Art Festival? Do you have an Email a_______? Do you have an Art Festival? do you have an adobe password? Do you have an apple?这里用an对吗? Do you have an appointment里面的an是什么意思. who do you think has an apple还是who do you think have an apple Do you have an English book?和have you an English book?有什么区别 have,orange,you,an,do .翻译句子作语法说明 Do you have an e-mail address?的中文意思 do,have,when,contest,english,you,an 连词成句 do you have an e_mail address? what is it ? Do you have ( )orange A：a B：an c:some When do you have an English test?这句话对吗？