They knew nothing about he was a thief.A. thatB. whichC. whatD. the fact that

问题补充：

They knew nothing about he was a thief.

A. that

B. which

C. what

D. the fact that

答案：

A. that

B. which

C. what

(答案→)D. the fact that

解析：考查同位语从句。句意：他们关于他是一个小偷的事实什么也不知道。that后的从句解释前面的名词the fact，是同位语从句，所以选D。