Question

Thinking      you know        in fact you don’t know is a terrible mistake.

A．that, that

B．what, what

C．that, what

D．what, that

Answer 1

C

考查名词性从句。句中that引导宾语从句，在从句中作主语；what引导宾语从句，在从句中作宾语，故选C。