I had been a university student for three years, but not until this afternoon had I felt the thrill of ________.
该句的意思是： 当时我已经大学三年级了， 但直到这天下午我才感到了一种满足感。 confusion 混乱，混淆； disappointment 失望； sensation 感觉， 感情， 感动； fulfillment 履行， 实行， 满足。