UC知道since last year,there have been fewer accidents
来源：百度知道 编辑：UC知道 时间：2024/05/09 16:10:14
为什么这里要用been？请详细解答，谢谢！
这里的been是there be 句型的现在完成时，常与since 搭配使用
看到since就说明是完成时，而这是一个there be 句型，be 要变成过去分词，也就是been.
因为是个完成时态啊，since和完成时连用
问道填空题：he never _______ (go) to school since last year.
in last year,last year和in the last year
in the last year 还是 last year???
一道初一英语题I _____ping-pong quiet well，but I haven‘t had time to play since last year。
over the last year
No trees ----last year
I____the CD since last month
I can't say ____ I want to see you again.It's been a year since I last saw you .
He left last year and____away ever since. A:is B:have been C:was D:has been为什么选D啊?ever
not since last summer 什么意思?