分词作定语与不定式作定语的差别

分词作定语与不定式作定语的差别
课本25题
The workers were proud of their products ______________ at the exhibition.
a.having been displayed b.having displayed
c.to be displayed d.to displaying
答案给的是a
但是书上明明有写
“作定语用的现在分词只用来叙述和主要动词差不多同时发生的动作,如果分词表示的动作在时间上有先后,一般不用现在分词,要用定语从句.例如：
误：do you know anyone having lost a cat?
正：do you know anyone who has lost a cat?”
我认为该题跟书上解释现象一致,因此不能用having been displayed
请问选c项可以吗?是不是改成to have been displayed 就对了