问题
选择题
So difficult _______it to work out the problem that I decided to ask Tom for some advice.
A．I did find
B．did I find
C．I’ve found
D．have I found
答案
答案：B
句意：发现解决这个问题如此困难，所以我答应向汤姆咨询一下。So位于句首，应使用部分倒装。另外本句用过去时态。