Look and correct the mistakes.(改错)
问题描述：
Look and correct the mistakes.(改错)
I haven't seen you for a long time since you leave here last year.
答
I haven't seen you for a long time since you leave here last year.
I haven't seen you for a long time,since you have left here last year.
for ,since 都必须出现在完成时中,同一句话同时出现,必然要使用两个完成时