To my _________ ,he fot only 50 in the final exam 为什么要用surprise

问题描述:

To my _________ ,he fot only 50 in the final exam 为什么要用surprise

To one's +名词 意为“令.....的是
to my surprise 令我惊讶的是

To one's surprise 是固定搭配。。To one's + n.

由后面的he got only 50 in the final exam(他仅得了50分)得知.to one's surprise:使某人吃惊的是

Why not?