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
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 |
参考答案: