________ that I was puzzled
A.So difficult a question did he ask me
B.Such difficult a question did he ask me
C.Such a difficult question he asked me
D.He asked me a so difficult question
网友回答
A解析考查倒装句。so +形容词或副词，或such +名词放在句首时，使用部分倒装，助动词提前，句意：他问了我一个如此难的问题以至于我很困惑。如此难的一个问题应表达为so difficult a question或such a difficult question，所以选A 。