he regretted what silly mistakes he had made中为什么用what而不是that,how

he regretted what silly mistakes he had made中为什么用what而不是that,how what he regretted that he had done这是感叹句么?为什么用what 这是高三复习资料上的一道改错题，这是改过的正确答案。what是改的空。 he si my heart he regretted what he had done during during the university,he ____the chanceto achieve more life goals.A.could have B.WOULD HAVE C.COULD HAVE HAD D.MUST HAVE HAD what shen me yi si He is now in the pen.He regretted having done that.只翻译in the pen A short while ago,however,he became a bus driver and he was not regretted it.在这句话中regretted是什么词性,起什么作用 (He regretted having picked Jones as captain of the team.)翻译为中文 the time was not far off when he ——this decision a has regretted b.had regretted c.will regret d.the time was not far off when he ——this decisiona has regretted b.had regretted c.will regret d.would regrettedb 为什么不对/ He become a bus driver and he has not regretted it 这里为什么用has not 切勿乱说 SI si 几道英语题（+理由）Everyone was at the party except you.What happened?I _____after Mike,my pet dog,at home.He was ill.A.have looked B.was looking C.would look D.had lookedKate _____in America for many years,but she's never regretted her deci what he is what he daming regretted that he broke the window of the classroom.(改为简单句） daming__ __the window of the class. he is poor .he si very happy.合并一句 he si tall and he has brown hair. The moment he had said this,he regretted it.请翻译这个句子,并分析它的构成...是不是the moment that he had said this...啊?