Question

—Can I buy a film ticket?

—Oh, sorry, we ___________.

1. A.
   sold them out
2. B.
   sold out them
3. C.
   have sold them out
4. D.
   have sold out them

Answer 1

C
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。