It was ______ in the exam that ______ how much time I had wasted. 

A．not until I failed;I realized

B．until I failed; I didn’t realize

C．not until I failed; did I realize

D．until I failed; I realized

“不识庐山真面目，只缘身在此山中”这句富有哲理的诗句说明了（）

A.近因效应

B.苏东坡效应

C.从众效应

D.刻板效应