after what was about ten minutes,the teacher gave the students the correct answer to the question.
问题描述：
after what was about ten minutes,the teacher gave the students the correct answer to the question.
after 在这个句子中是介词,它引导一个宾语从句是吧
答
是宾语从句.after what was about ten minutes= after a period of time [which was about ten minutes]