itisthevarietyandintensityofthecolor,thatmakeitsparkleinthelight.中that做什么成份

问题：itisthevarietyandintensityofthecolor,thatmakeitsparkleinthelight.中that做什么成份

答案：↓↓↓

李之文的回答：

网友采纳　　在该句中itis+『』+that+为强调句,『』为所强调部分,如thevarietyandtheintensityofcolor.在强调句中that不做成分,但指代所强调部分