首先WHO不是介词,其次be sure 接that从句时,意为：认为…一定会,主语必须是人,连词that可以省略,be sure 后面还可以接由whether, where, when 或 who 等引导的名词性从句,这时,主句通常是否定形式.E.g.
我不能肯定今晚是否有空.
I am not sure whether I will be free or not tonight.
he was sure he would be all right.为什么没有介词WHO
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