we think it our duty to help others为什么用 it 不用 this that_英语解答

we think it our duty to help others
为什么用 it 不用 this that

人气：189 ℃　时间：2019-12-14 23:14:37

解答

this 和that 不能做宾语,但可做主语.
而it既可以做主语又可以作宾语.
如果用this 或that的话,必须是：we think this/that is our duty to help other.