I would love to the party last night but I had to work extra hours to finish a report.A.

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A. to go
B. going
(答案→)C. to have gone
D. to be going
解析：本题考查非谓语动词。would love或would like后要接动词的不定式形式，不能跟动词的-ing形式，排除B；would love to do sth. 意为“想去做某事”，指将来的动作；would love to have done sth．意为“本来打算去做某事，而由于某种原因没有做。”根据题意“昨晚我本打算去参加宴会的，但我不得不加班赶完一份报告。”可知答案为C项。