---- arriving ----- home ,he began to do this homework. A.on:at B.With:in C./:at D.On:/
问题描述：
---- arriving ----- home ,he began to do this homework. A.on:at B.With:in C./:at D.On:/
为什么前面要用On?
答
选D
on doing,.一..就...
home 是副词,前面不加介词at
On arrivinghome ,he began to do this homework.
翻译：一到家,他就开始做作业.