When        if he hadany idea what the novel was about, Jack kept silent. He       have read it very carefully.

A．asking; needn't

B．asking; shouldn't

C．asked; can’t

D．asked; mustn^’t

正式组织与非正式组织的运作基础不同，正式组织的运作基础是（）。

A.兴趣

B.爱好

C.法律

D.制度、规范