分类：教育/科学-外语学习-英语考试
问题：一道英语单选题Thinging____youknow_____i 
Thinging____you know_____in fact you don't is a terrie mistakeAthat that B what what C that what D what that
回答：Thinging____you know_____in fact you don't is a terrible mistake Athat that B what what C that what D what that 
选C，thinging应该是Thinking,作整个句子的主语，
前一空that 引导宾语从句,
后一空,what,引导what you don't(know)作know 的宾语从句，
认为你懂实际上你所不懂的东西是件可怕的事。