新概念2第四课里面都用了什么时态have just received a letter from my brother,Tim.He is in Australia.He has been there for six months.Tim is an engineer.He is working for a big firm and he has already visited a great n
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一般现在时和现在完成时
======以下答案可供参考======
供参考答案1:
现在完成时态，现在进行，将来时态