. 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
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(答案→)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
解析：考查固定句型。So/such... that...“如此......以至于......”，such+a/an+adj.+n.；so+adj.+a/an+n.。句意“他问的问题那么难，以至于我哦也很迷惑。”so谓语句首时，应该用部分倒装，即把谓语的一部分提到主语前。故选A。