--- Did you have a good time at Laura’s birthday party?
--- Yes, indeed. It’s several years ________ I enjoyed myself so much.A.whenB.beforeC.sinceD.that
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C解析“It is + 一段时间 + since + 从句”意思是“自....发生以来已经一段时间了”。如：it is three years since he died.(自)他去世以来已经三年了。“It is + 一段时间 + before + 从句”意思是“过了一段时间...才发生”。如：It is 3 years before they accept the fact.过了三年他们才接受这个事实。故根据句意选C：这是几年以来我才玩得如此开心。