17.Xi'an is ___ old city with ___ long history,isn't it?

问题描述:

17.Xi'an is ___ old city with ___ long history,isn't it?
A.a,an B.an,a C.the,the D.the,a

首先排除c 跟 d 因为这个Xi'an 是第一次出现 不需用到定冠词the 除非后面还有其他句子,而那些句子出现了Xi'an 才需要用到特指冠词the
b
old 元音开头 用an