英语语法问题一.I appreciate having been given the opportunity to st

英语语法问题
一.I appreciate having been given the opportunity to study abroad two years ago.two years ago 不是说有具体的时间短语时就不能用完成是吗?二.After hanging up the phone ,I thought of all the right things I might have said,and didn't.and didn't 这里一定省略了什么.总结讲解一下省略句.It seems to me that I was going in by the iron entrance gates.为什么要用by 而不用throught.Not restricted to their roles as wives and mothers anymore the equal parters of men.为什么要加上to.请帮帮忙了.