问题补充：
The tickets for the Imax film are selling so well. Try to buy one before all the tickets .
A. will be sold
B. will be sold out
C. are sold
D. are sold out
答案：
A. will be sold
B. will be sold out
C. are sold
(答案→)D. are sold out
解析：sell表示卖的意思，为不及物动词，sell out表示卖完的意思，相当于及物动词，可以有被动语态，故选D
