Question

Knowing _____, as a matter of fact, one shouldn’t know is a terrible thing．

A．whether

B．that

C．what

D．when

Answer 1

C

考查賓語從句，what為連接詞作one shouldn’t know 的賓語，as a matter of fact,為插入語。句意：事實上一個人知道了不該知道的事情是非常可怕的。