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

（）和助排剂都属于表面活性剂。

A.稠化剂

B.交联剂

C.破乳剂

D.粘土稳定剂