问题
选择题
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
答案：B
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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