So amused _______ that I couldn’t help laughing when I saw the children dressed up as Santa Clauses on Christmas Day.

A. did I feel      B. had I felt       C. was I felt       D.I felt

So amused ________ that I couldn't help laughing when I saw the children dressed up as Santa Clause on Christmas Day．

1. A.
   did I feel
2. B.
   had I felt
3. C.
   I felt
4. D.
   I had felt

So amused _______ that I couldn’t help laughing when I saw the children dressed up as Santa Clauses on Christmas Day

1. A.
   did I feel
2. B.
   had I felt
3. C.
   was I felt
4. D.
   I felt

So amused _____ that I couldn't help laughing when I saw the children dressed up as Santa     Clauses on Christmas Day.  

A．did I feel                B．had I felt            C．I felt            D．I had felt  

So amused ________ that I couldn’t help laughing when I saw the children dressed up as Santa Clauses on Christmas Day.

       A. did I feel           B. had I felt     C. I felt                    D. I had felt