people have been ill from a strange disese these days,_____we have never heard of before

题目

people have been ill from a strange disese these days,_____we have never heard of before
Many people have been ill from a strange disese these days,_____we have never heard of before.
A.it B.that C.one D.this
标准答案选C,但是不是特指么,为什么不用the one

答案

不是特指 因为"a strange disese "一种奇怪的病毒 而且我们还没有听过的的病毒有很多 因此无法特指 这个我们还没有听过的的病毒就是此奇怪的病毒