问题
选择题
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
答案
答案：C
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。
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