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 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 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 findC．I have foundD．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

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 advice．

     A．I did find      B．I have found         C．did I find      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

So difficult _______it to work out the problem that I decided to ask Tom for some advice

1. A.
   I did find
2. B.
   did I find
3. C.
   I’ve found
4. D.
   have I found