By the way, there is one point ()which I should like your opinion.
()中为什么要填on而不是at?
顺便解释一下on the point和at the point的区别.
谢!

这个考点并不是on the point


顺便说一下,还有一点我想听听你对此的看法。one's opinion on/upon某人对...的看法
There is one point that/which I should like your opinion on.
--There is one point on which I should like your opinion.（介词提前的定语从句）

你要解释一下on the point和at the point的区别

只有be on the point of


be on the point of 正要(去做某事)。如:

The coach was on the point of giving up the game when our team scored two points.

教练正打算放弃这次比赛时， 我们队得了两分。


at the point of 几乎要。如:

When Mary broke her favorite bracelet, she was at the point of tears.

当玛丽打碎了她心爱的手镯时，她几乎都要哭了。