Did you have a good time at Laura’s birthday party?- Yes indeed. It’s several year

问题补充：

--- Did you have a good time at Laura’s birthday party?

--- Yes, indeed. It’s several years I enjoyed myself so much.

A. when

B. before

C. since

D. that

答案：

A. when

B. before

(答案→)C. since

D. that

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。