问题
选择题
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
答案：D
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