问题补充：
—Shall we go to Australia for the long holiday ?
--Sorry. I there twice.
A. have gone
B. was
C. have been
D. go
答案：
A. have gone
B. was
(答案→)C. have been
D. go
解析：句意：我们去澳大利亚度长假吧？对不起，我去过两次了。过去发生的事情对现在造成了影响，用现在完成时，have gone去……;表示这个在去的途中或已经到达某地；have been去过，表示已经回来，结合语境故选C。
