--- 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
网友回答
A. when
B. before
(答案→)C. since
D. that
解析：when 既然，当……时；before在……之前；since由于，自从……以来；that因此，以至于。句意：你在劳拉的生日聚会上玩得高兴吗？——是的，没错。已经有好几年我没有玩得这么高兴了。结合语境可知下文描述的是从过去某时起到现在的状态，故选C。