I have been abroad only ____(两次)

I have been abroad only ____(两次) I have never been abroad .He has never been abroad,either.的同义句 i have never been abroad before 这个before是什么词性 i have been there 和 i have been to china为什么一个有to一个没有?比如说：i have never been abroad,为什么不说成i have never been to abroad. This is the first time when I go abroad,还是that I go abroad?I've been abroad for the first time.里有个for，那为何不写成This is the first time that I have been abroad for. 1,have you ever____?A,abroad B,go abroad c,going abroad D,been abroad o,i have been here before是什么意思 Have you been abroad为什么abroad前不加to Have you ever (been abroad)?为什么不用gone abroad或been to abroad? i have been to abroad once 请问这里的once 什么词性做什么成分 I have never been abroad I have never been abroad.- ————空A so do i B so haven't i C neither am i D neither have i应该选那个?为什么? i’ ve never been to abroad. 和i haven't ever been to abroad. 一样吗 I appreciated () the opportunity to study abroad two years aog.A .having been given B.having beenC.to have been given D.having been robbed主要求解释. How many times have been abroad before.N____ His both parents have been abroad 这句话对吗 单句改错 He has said to have been born abroad. I greatly appreciate（）the opportunity to study abroad two years ago.A giving B have been given C give D having been given 分析时态,句子成分, that was the second time i had been abroad这一句中为什么不用I was abroad?