题目内容
【题目】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】句意:发现解决这个问题如此困难,所以我决定向汤姆请教一下。so位于句首,主句应使用部分倒装。另外本句用一般过去时。
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