No one knows exactly ______ this important discovery was made.
#33284
A
that
B
that how
C
what
D
when
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________ I can see, there is only one way to solve this problem.
#34013
A
As soon as
B
Even if
C
As long as
D
As far as
—I wonder how much you charge for your services.—The first two are free ________ the third costs $30.
#30476
A
while
B
until
C
when
D
before
28．She’ll never forget her stay there ________ she found her son who had gone missing two years before.
#79575
A
that
B
which
C
where
D
when