英语句子改错 He has taught for several years before becoming a writer .哪里错了,怎...
问题描述：
英语句子改错 He has taught for several years before becoming a writer .哪里错了,怎...
英语句子改错 He has taught for several years before becoming a writer .哪里错了,怎么改?
答
He has been teaching for several years before became a writer.