雅思作文中一句話幫我分析其語法結(jié)構(gòu)
這是圖表題,作者寫到：
The amount of goods transported by water was constant from 1974 to 1978,where it showed an exponential growth,rising to almost 60 million tonnes after which is plateaued for about 20 years before starting to rise gradually again.
1.1978 后的 where it showed ,是什么從句?
2.60 million tonnes after which,這里的 after,是跟 60 million tonnes after,還是應(yīng)該 after which 一塊的呢?我認(rèn)為是 60 million tonnes after ,但which后是什么從句呢?
3.老師說過 before,代表意思是 “才”,后面算什么,現(xiàn)在分詞作狀語嗎?