4、if you kept your nose clean, you had a job for life.
如果你规规矩矩，就可以一辈子都有这份工作。
kept作为过去分词时，被保留，必须与助动词一起使用
1、A meticulous attitude should be kept in her class.
在她上课的时候要保持一个认真细致的态度。
2、We have kept in contact with each other.
我们彼此相互联系已经有一段时间了。
3、They started years and years ago and they have kept it up.
多年前他们就一直这样而且继续保持这项传统。
拓展：
keep 的现在分词是keeping ，一直做某事，重复做某事
1、His behavior was not in keeping with the solemn occasion.
他的举止与这庄严的场合不协调。
2、This will wick the sweat away from your body, keeping you dry.
这将会让你身上的汗水吹干，使你的身体保持干燥。
3、Keeping your eye on the ball remains the best advice.
你的眼睛一直保持着球，这是一个非常好的建议。返回搜狐，查看更多