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
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
B
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。