当关系词指代整个句子时,只能用as和which,不能用that 能举一个例子吗?

当关系代词指代整个句子时都是非限制性定语从句,定语从句前要加逗号,关系代词不能用that,表示“事”或“物”只能用which,as,表示“人”只能用who,whom.用在句首时只能用as.
He seems not to have grasped what I meant,which greatly upsets me.
他似乎没抓住我的意思,这使我心烦.
Liquid water changes to vapor,which is called evaporation.
液态水变为蒸汽,这就叫做蒸发.
As is known to everybody,the moon travels round the earth once every month．
这如大家知道的那样,月亮每个月围绕地球运转一周.（as 引导的就是置于句首的非限制性定语从句,修饰后面的整个句子.）
以上这三个例句中都不能用that来引导.