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：
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。句意是：想想，你知道你事实上不知道的事是个严重的错。