问题
选择题
Knowing _____, as a matter of fact, one shouldn’t know is a terrible thing．
A．whether
B．that
C．what
D．when
答案
答案：C
考查宾语从句，what为连接词作one shouldn’t know 的宾语，as a matter of fact,为插入语。句意：事实上一个人知道了不该知道的事情是非常可怕的。