Not until ________ in the college entrance exam ________ that he had wasted much time using his mobile phone to surf the Internet and play games.

t isindeed a wise man.—Oh, yes. Howoften I have regretted ______ his advice!

How didyou such a clever way out of difficulty

下列对有关典故的分析，不正确的一项是

12 The problem wasn’t_______hard The little girl worked it out quickly