用现在完成时和过去时都可以,但强调的点不同.用完成时表示电话已打,用过去时则强调打电话的时间是过去.过去完成时和过去时连用表示两个先后的动作,过去完成时表示“过去的过去”.
我今天已经给姑妈打过电话了,但是她的电话占线.
I have phoned my aunt today but her line was busy.这句话中为什么用现在
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