Question

That was a really good evening .It's years_____ they enjoyed themselves so much.

A. when B. that C. before D.since 该选哪个？为什么？

Answer 1

D.since
It's years since they enjoyed themselves so much.
他们已经好久没有这样开心了。

Answer 2

since It's 即 It has been,现在完成时

追问

It has been 可以 缩写成It‘s 吗？

追答

可以，用于句首。