____took about three days to finish the work

问题描述:

____took about three days to finish the work
用I 还是it?貌似2个都可以啊!都成立 用I是我用了3天完成这项工作.用it是这项工作花费了我3天时间啊!.

用it了啊
固定用法,如果是i的话要用spend之类的词.
it takes somebody sometime to do sth.