Question

【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

Answer 1

【答案】B

【解析】在so…that…结构中，当把so及所修饰的词一起置于句首时，主句要用倒装，排除A、C两项；根据后面的decided可知用一般过去时。