问题
选择题
As the busiest woman in Norton, she made _______ her duty to look after all the other people’s affairs in that town.
A．this
B．that
C．one
D．it
答案
D
it作形式宾语，真正的宾语是后面的动词不定式短语to look after all the other people’s affairs in that town。注意:只有it能作形式宾语,不能用this, that或one等其他代词。