问题
It was when searching for the lost book whose cover was missing ______ a secret letter addressed to his mother.
A:what he found
B:until he found
C:that he found
D:he had found
B:until he found
C:that he found
D:he had found
正确答案是：
同类题型
ite, who comes from____ European country,has formed the habit of attending _____church on Sundays.
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