我认为有不妥之处.可以这样改.
What a pity it is that china doesn't have a top band about bicyle !
这是一句感叹句.that 引导的主语从句,为了防止句子头重脚轻,通常把形式主语it放在主语从句的位置,that从句移到句尾.
这样改完之后 that china doesn't have a top band about bicyle 还是主语从句的;
表语是What a pity ,它不是句子.
个人见解,水平有限,不对之处请谅解.