题目内容
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
D
解析:
略
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题目内容
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
D
略