问题补充：
—Can I buy a film ticket?
—Oh, sorry, we .
A. sold them out
B. sold out them
C. have sold them out
D. have sold out them
答案：
A. sold them out
B. sold out them
(答案→)C. have sold them out
D. have sold out them
解析：sell out是固定短语表示售光，卖完的意思；out是副词后跟人称代词时，要放在两次的中间。
