So difficult______it to work out the problem that I decided to ask Tom for advice.
So difficult______it to work out the problem that I decided to ask Tom for advice.
A. I did find
B. did I find
C. I have found
D. have I found
答案:B
解析: 以so+形容词开头的句子要进行倒装,构成“so+形容词+倒装+that从句”结构。表示“……那么……,以至于……”。