--What about the books?--Books of this kind ________ well.

问题描述:

--What about the books?--Books of this kind ________ well.
--What about the books?
--Books of this kind ________ well.(Unit9-8)
A.sell?B.sells?C.are sold?D.is sold
为什么选A不选B?请分析一下语法.

of this kind是修饰,不是主语