When if he had any idea of what the novel was about, Jack just kept silent.
A. asking
B. asked
C. to ask
D. being asked
网友回答
A. asking
(答案→)B. asked
C. to ask
D. being asked
解析：考查状语从句的省略式，当主从句的主语一致时，可以省略从句的主语和be动词，when asked=when he was asked句意：当被问及是否知道这个小说是关于什么的，杰克只是保持沉默。选B。