I can't but （ ） with the teachers who shared their opinions in t

I can't but （ ） with the teachers who shared their opinions in the video.
A、to agree
B、agreeing
C、agree
D、agreed
【正确答案】：C
【题目解析】：不带to的不定式。can't but后面跟不带to的不定式，即动词原形。选项C正确。