情态动词 与 could have done

情态动词 与 could have done
I saw jack in the market this wednesday.
You ____him；he is still studying in the USA,
答案用的是could not have seen 也好理解,但是选项中也有 can not see
感觉这块没学好o(╯□╰)o.不知道为什么can not see 是错的.