Only after the plane had taken off _________ that he missed his parents so much.

A. he found    B. he had found            C. did he find         D. was he found

Only after the plane had taken off _________ that he missed his parents so much.

1. A.
   he found
2. B.
   he had found
3. C.
   did he find
4. D.
   was he found