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I have been missing you very much after I went to college a

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I have been missing you very much after I went to college a year ago.
这句话中为什么after不能用,要改为since?二者如何区分?
since是完成时的标志,本句中的have been missing是完成时标志
after指的是过去,给您来个例句;After breakfast Amy ordered a taxi.早饭后,埃米预订了一辆出租车.可见,after一般用在过去时中