中国铁矿石进口来源:I had been sitting 和 I have been sitting 的区别

I had been sitting 和 I have been sitting 的区别 I had been sitting的意思.,时态,,相关句子-举例 I have been sitting 的意思.,时态,,相关句子-举例 The letter I had been looking forward _____at last. HAD BEEN TO You smiled and talked to me of nothing and I felt that for this I had been waiting long 请教had been 的用法 从句you had been gone I HAD A DREAM i had a dunkey