问题补充：
---Where is your father?
---He Australia and he Sydney for two weeks.
A. has been to; has been in
B. has gone to ; has been in
C. has been in; has been to
D. has gone to ; has been to
答案：
A. has been to; has been in
(答案→)B. has gone to ; has been in
C. has been in; has been to
D. has gone to ; has been to
解析：句意：你的父亲在哪儿？——他已经去了澳大利亚，并且他已经在悉尼呆了两周。在完成时态中has been to 是已经去过某处，并且已经回来了。has gone to 是已经去了某处，但是到目前为止还没有回来。 has been in 是已经在某处，并且现在还在那里，而且有可能要延续下去。 结合语境可知选B。
