法律实施的最主要的保证是( )。

A．社会舆论

B．传统力量

C．人们的自觉维护

D．国家强制力

I knew nothing of the motives behind his recent move, and I don't know either the person to put him up to the action.

A．nor did I know... who

B．not did I know... that

C．nor do I know... that

D．either did I know... who