翻译：自从他来到这已经3年了（注意since后面的动词,若为延续性动词则要译为某人不干什么已经多久了,其余情况,正常翻译即可）
这种it is ... since ...是等同于完成时态的it has been...since...,这是特殊情况,在做单选时要注意,若要选完成时,而选项中无完成时,可用一般现在时代替
其次,since和完成时连用,指主句与完成时连用,而且,since不一定和完成时连用.
若改为that,则不为强调句,也不为定语从句.
分析这个英语句子的时态和句意!it is／was 3 years since he came here.since不一定
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