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usiness C. So her business was successful D. So was her successful business (2) So difficult _________ it to work out the problem that I decided to ask Tom for advice. (廣東卷) A. I did find B. did I find C. I have found D. have I found 3. 考查類似“so do I”結構的倒裝 So do I這類結構表示的是前面提