So difficult ____ it to work out the pro
题型:选择题
问题:
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
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