同学你好，该知识点来自沪江网校《英语零基础直达大学六级【双11专享班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
答案如下：
I 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 number of different places in Australia. He has just bought an Australian car and has gone to Alice springs, a small town in the centre of Australia. He will soon visit Darwin. From there, he will fly to Perth. My brother has never been abroad before, so he is fending this trip very exciting.

has already visited是对的。
注意不要受到空格的影响，答案如果和空格有冲突，依然保持正确答案即可。

因为版权原因，网校无法为同学提供课后题答案了，同学可以在网上搜搜新概念教师用书（内含答案）。
做题过程中如果有不懂的问题可以随时在答疑区提问的。

祝同学学习进步~