题目内容：

When do you start to work?为什么要加to?

优质解答

是个固定短语 start to do 或者start doing&区别在于：1) 谈及一项长期活动或开始一种习惯时,使用doing.How old were you when you first started playing the piano?你几岁时开始弹钢琴?2) begin,start用进行时时,...