问题详情：
—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
【回答】
【*】B
【解析】考查动词的语态。主语the book和动词sell构成被动关系，又时态为一般现在时，因此用一般现在时的被动语态。答语句意“对不起，你要的书已售完”。故选B。
知识点：动词语态
题型：选择题
