since后面一般接时间点而不是时间段。
since：
prep.自从;自…以后;从…以来;(表示气愤)何曾，什么时候。
conj.因为;由于;既然;从…以后;自…以来。
adv.自…以后;从…以来;此后;后来。
扩展资料
Its a long time since they left.
他们已经离开很久了。
Its been two weeks now since she called.
她到现在已经有两个星期没来电话了。
I had been out since I was 17.
我从17岁起就公开我是同性恋。
The children are completely out of control since their father left.
这些孩子自他们的父亲离开后就无法无天了。
Its been an age since weve seen them.
我们有很长一段时间没有见到他们了。
