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    So difficult it to work out the problem that I decided to ask my teacher for advice. A. I did find B. did I find C. I have found D. have I found 【查看更多】

     

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    So difficult ________ it to work out the problem that I decided to ask my teacher for advice.

     A. I did find     B. I have found     C. have I found    D. did I find

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