It was when searching for the lost book whose cover was missing ______ a secret letter addressed to his mother.
#85170
A
what he found
B
until he found
C
that he found
D
he had found
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I can’t remember ______ I met the man. 
#85471
A
where was it
B
it was where  
C
where it was that
D
where was it that
 ---______ the farmers discovered the entrance to the secret cave in the valley?--- Totally by chance.
#85269
A
When was it that
B
How was it that
C
How it was that
D
When it was that