Wasitwhensearchingforthelostbookwhosecoverwasmissing　　...

问题详情：

 Was it when searching for the lost book whose cover was missing 　　　 a secret letter addressed to his mother?　 

A. did he find　　                       B. until he found　　

C. that he found　　                    D. had he found

【回答】

C

知识点：倒装与省略

题型：选择题