这里应该是因为的意思,用法嘛,太多了,帮你找找。 找到了,如下:
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. (常用于现在完成时或过去完成时)自...以来,从...至今 I haven't heard from him since last year. 我自去年以来未曾收到过他的信。 conj. 1. (常用于现在完成时或过去完成时)自...以来,从...至今 It's been ten years since they married. 他们结婚到现在已经十年了。 She has been living a hard life since her husband died. 她自从丈夫死后,一... |