四川省2015高考英语人教版一轮讲义：选修6 Unit 1（2）
By coincidence，oil paints were also developed at this time，which made the colours used in paintings look richer and deeper.巧合的是这一时期油画颜料也得到了发展，它使得绘画的色彩看上去更丰富、更深沉。
本句为复合句，含有which引导的非限制性定语从句，对前面的整个句子进行限定。
①Helen was much kinder to her youngest son than to the others，which，of course，made the others envy him.
