单选题 13.  Which one of his books do you think ______ best among the best-sellers?
【正确答案】 A
【答案解析】 本题句意:你认为他的哪一本书在畅销书中卖得最好?sell一词,可以用主动表示被动,主语为单数“one of his books”,所以用sell的单三形式sells。故选A。