there’s no doubt that 和it’s no doubt that区别

there's no doubt that 和it's no doubt that区别
我刚才查了好多地方意思都说意思差不多或者有说没有it's no doubt that 的说法.但是很多选择题里面同时出现这两个的时候都是选的there's no doubt that到底是怎么样么?

there's no doubt that是固定结构,而it's no doubt that 我没有见过,最好不要用.李阳的疯狂英语上说的是there's no doubt that的结构!