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our maths teacher has _______ Australia for a week.a.gone to

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our maths teacher has _______ Australia for a week.a.gone to b.been in c.arrived in d.been to
疑问是 has gone to 怎么用?go不是终止性动词吗?为什么会有完成时的形式?我看说 has gone to 是表明去了某地还没回来,has been to 是曾经去过,现在已经过来了,那么这里has been in 举几个例子,
has been in 表示现在已经在某地,并且要在那里呆一段时间,如果没有for a week,就可以用has gone to.has been to 是曾经去过哪里,现在已经回来了.