定语从句中先行词尽量就近指代 你是指og12上面的解释吧, C选项 the beginning of the universe was an explosive instant...that has expanded是SVO that VO结构,that引导修饰宾语的定语从句,已经不太可能去修饰主语即 the beginning D选项依据就近原则,that一般修饰instant,但也有可能修饰the beginning,比如instant换成复数,从语法形式上考虑那只能修饰the beginning。og上的解释可能是为说明that即使修饰the beginning也是不对的,因为只能expand前面只能是universe。另外is expanding时态不对,后面有ever since.