-What was the party like ? -Wonderful . It is years I enjoyed myself so much . A. afterB.

-What was the party like ?
-Wonderful . It is years I enjoyed myself so much .
A. after
B. when
C. before
D. since

A. afterB. whenC. before(答案→)D. since解析：英语中It is + 时间后三种不同的用法。其一是：It is + 时间+ that …，这是强调结构的句型，如：It is always on Wednesday morning that the famous professor comes to give us a lecture about Chinese literature . (那位著名的教授来给我上中国文学课总是在星期三上午)；其二是：It is +一段时间before …，这一句型的意思是：完成这个从句所发生的事所需的时间量，如：It is about a week before a Londoner can get a letter you post in Beijing today . (一个伦敦人要收到你今天在北京寄出的一封信需要一个星期的时间。)；其三是：It is +一段时间＋since …这一句型表示的是从从句中动词的动作起所延续的时间。

感谢回答，我学习了