since的意义和用法
问题描述：
since的意义和用法
答
sinceKK:[]DJ:[]ad.(常用于现在完成时或过去完成时)1.此后;从那时到现在She left school three years ago and has worked as a nurse ever since.她三年前毕业,从那时起便一直当护士.2.之前,以前prep.1.(常用于现在...