河流被污染,它实际上起火燃烧
The cuyahoga river in ohio was so polluted that it caught fire as recently as 1969.
俄亥俄州的凯霍加河被污染的极其厉害,以至在1969年引发大火.
只要注意so that 是原因状语从句,并知道是被动结构就行了.between his farmwork routines中between为什么不能换成during