Though the sound could be heard clearly ,it took me a long time to react.句子成分
问题描述：
Though the sound could be heard clearly ,it took me a long time to react.句子成分
答
it这里指代后面的to react~~为了避免句子头重脚轻,经常会用it指代句子后面的不定式
比如说it is really difficult to finish the work,it就是指代to finish the work