问题补充：
---Excuse me. I’m looking for Be the Best of Yourself.
---Sorry. The book you ask for out.
A. is selling
B. is sold
C. was selling
D. will be sold
答案：
A. is selling
(答案→)B. is sold
C. was selling
D. will be sold
解析：句意：打扰了，我正在找《做好你自己》这本书。——抱歉，你要的这本书卖完了。结合语境可知下文描述的是客观性的动作，故用一般现在时态。主语是动作对象，故用被动语态，选B。
