Some students think it cool to have their hair dyed yellow.为什么用it 不用that 高三狗求指教
问题描述：
Some students think it cool to have their hair dyed yellow.为什么用it 不用that 高三狗求指教
答
一般在一个句子中（前后句中间有标点的不算）,it 较多用作代词,that较多用于引导从句.
这里 it 用于指代 to have their hair dyed yellow 这件事