( ) __________ interesting story I have ever heard!

问题描述:

( ) __________ interesting story I have ever heard!
A) What B) How C) What a D) What an
请问是C还是D?
到底是因为有interesting而用an 还是主语是story而用a?

D,a和an只和紧接在后面的词的首字母有关