【题目】— Did you have a good time last night?
— Yes, I did. It was a long time since I _____ myself.
A.haven't enjoyed
B.didn't enjoy
C.enjoy
D.had enjoyed

【答案】D
【解析】上句：昨晚你过得很愉快吗？下句：是的。很长的时间没有这么开心过了。也就是说：昨天晚上以前曾经有过一次开心。此处表达的是“过去的过去”，所以since引导的时间状语从句要用过去完成时态，故选D。