it的三大用法

2006年离考英语湖南卷有这样一道单项选择题： 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     

八组英语常考名词辨析

1.reason,cause,excuse reason表示一种看法或行为的"理由,动机,原因";cause是造成一种事实或现象的"原因,起因";excuse是"借口"的意思。用reason,cause,excuse填空:(1)—I'm sorry I stepped outside for a smoke.I was very tired.—There is no ___ for this while you are on duty.