Thinking you know in fact you don’t is a terrible mistake.
A. what, what
B. that, what
C. what, that
D. that, that
网友回答
A. what, what
(答案→)B. that, what
C. what, that
D. that, that
解析：句意是：想想，你知道你事实上不知道的事是个严重的错。这题考查的是名词性从句，that引导宾语从句，在从句中不做成分，what引导宾语从句，what做know的宾语。选B。