it is known to all that smoking is harmful to one's health “ that” 作什么成分啊?
问题描述：
it is known to all that smoking is harmful to one's health “ that” 作什么成分啊?
答
连词that引导的主语从句.
it is known to all that smoking is harmful to one's health “ that” 作什么成分啊?
连词that引导的主语从句.