We couldn't work it out .里的"it"指代什么?

__the problem,we couldn't know how to work it out.__with so The problem was so difficult that we couldn't work it out ea It rained heavily yesterday,so we couldn't go out.改同义句以We co so such区别比如这个句子.It was ------difficult work that we couldn't 这句话里的work if we go by taxi it's going to work out very expen 请问《we can work it out》的歌词是什么 sweetbox we can work it out 的歌词 谁知道we can work it out 的歌词 Sweetbox的We Can Work It Out的歌词有什么深刻含义吗?听后很感动 we can work it out 歌词翻译 we can work it out 中文翻译 碧昂斯的Work It Out