Question

So difficult ________ it to work out the problem that I decided to ask Tom for a

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

Answer 1

答案B
句意为“我发现计算出这道题这么难，于是我决定听听汤姆的建议”。在“so…that…”表示结果的句型中，若表示程度的“so…”部分置于句首时，主句应用部分倒装语序。由从句中时态可知，主句中应用一般过去时态。