having been done 例句的疑問.
例句：Having been told that bad weather lay ahead,the changed their course.
我有以下3個(gè)疑問：
1、這是一個(gè)簡單句還是復(fù)合句?如果是復(fù)合句,那么逗號前后兩句話那句是主句,哪句是從句?
2、having been told 在這里是否做狀語?做什么狀語呢?
3、也是最主要的一個(gè)疑問,前面having been done是現(xiàn)在完成時(shí)被動(dòng)語態(tài),那么后面的為什么還要用過去式?having been told 應(yīng)該先于changed發(fā)生的.如果后面用changed,前面應(yīng)該是had been done 也就是過去完成時(shí).