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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It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．
#85155
A
when; which
B
when; that
C
that; which
D
that; that
The question that puzzles them is ___they can finish the work on time.
#84854
A
what it is that
B
what is it that
C
how is it that
D
how it is that
It is not until the disease has progressed to AIDS ____a person begins to look sick.
#85053
A
who
B
that
C
where
D
before
.It was in the 1990s _______ we were working together ____ we made friends with each other.
#85314
A
that; when
B
when; that
C
that; that
D
when; when