简单的英语题几道简单的题,要解释,给分,谢谢There is an "h" in the word "hour"为什么用

为什么不是There is a (h) and an (u) in the word (hour). 什么字母前面要用an经常碰到这样子的题目There is _____"h"in the word ‘hour’A/ B There is an "h" in the word "hour",but the "h" is silent.中的" there is an "h" in the word "house".为什么用"an"修饰"h" There is ______ "h" in the word "hour". A.a B.the C.an D.\ There is ( )''h'' in the word ''hour''.A:a B：the C:an 请说明理由, there is ——“h” in the word "hour" A a B an C the D / There is( "h" in the word "hour".A.a B.an C./ D.one There is ( )“u” and ( ) “h” in the word “hour”. A.a a B.an a There is _____"u"and______"h" in the word "hour" 1.There is ____ "h" in the word "hour" There is ( ) "r " in the word "hour"