Did you have a good time at the party?Yes indeed. It’s years I enjoyed myself so

问题补充：

--- Did you have a good time at the party?

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

A. since

B. when

C. before

D. that

答案：

(答案→)A. since

B. when

C. before

D. that

解析：since 由于，自从……以来；when当……时；before在……之前；that因为，以至于。句意：在聚会上你玩得高兴吗？——是的，真的很高兴。有几年我没有玩得这么高兴了。句式It is+时间段+since+过去时态从句，表示有多久不做某事了。结合语境可知选A。