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
网友回答
A. he found
B. he had found
(答案→)C. did he find
D. was he found
解析：句意：只有当飞机起飞后，他才发现他是多么想念父母。考查Only引导从句放在句首时，用部分倒装。根据句意该句为过去时态。