It's been a long time since I started to teach at this school. 我在这所学校任教已有很长时间了. 【说明】It's = It has + been 因为后面的时间状语从句since引导,主句用完成时态. 再问： 填quite 为什么 再答： quite adv.相当, 颇, 有点儿的意思 这里用quite a long time也可以，是固定搭配，用于强调时间很长。 eg： I had waited for quite a long time before he turned up. 我等了他半天，他才来。
