Before he became a teacher,he has been a salesman for years 改错
问题描述:
Before he became a teacher,he has been a salesman for years 改错
答
如果要改错的话,后面应该用had been过去完成时,因为表达的是过去的过去。
答
在他当老师之前,他做了很多年的推销员
答
He had been a salesman for years before becoming a teacher.
答
把后面的has been 改成 had been