over the past year一定用现在完成时吗? 以前讲现在完成时时,老师说有over the past yea

楼上的解释也不对,如果over the last year是修饰breaking into several computer systems,那就应该是with having broken into several computer systems.
over the last year应该译为“一年以前”,不像你的老师说的那样,只用在完成时态中.如果,你还记得,over 有”超越,跨过”的含义,就不难理解 over the last year 可译为“一年以前”,实际上,over the last year = one year ago 就应该用一般过去时.
对了,说了半天,你是在问哪一个词组,是 over the past year 还是over the last year? 课本里的句子是over the last year,应该用一般过去时.