一道中考英语题,求解关于情景英语

问题描述:

一道中考英语题,求解关于情景英语
hello,may I speak to Mr.Li?
Sorry,wrong number.___a Mr.Li here.
a.this isn't b.that isn't c.there isn't d.it isn't
hello,may I speak to Mr.Li?
Sorry,wrong number.___a Mr.Li .

这两题答案没有区别,答案都是C There isn't.
意思都是“这里没有一个叫李先生的人”.
关键在于Mr Li前面的不定冠词a.
如果没有a,则答案是 A This isn't.
因为电话英语中用this代指I.