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(2013·山东，26)Mark needs to learn Chinese________his company is opening a branch in Beijing.
#67436
A
unless
B
until
C
although
D
since
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Evidence has been found through years of study _____ children’s early sleeping problems are likely to continue when they grow up.
#67792
A
why
B
how
C
that
D
whether
 Is this company _____ you visited Mr. Wang last week?
#69328
A
which
B
the one where
C
the one that
D
that
_________ it is snowing, it isn’t very cold.
#41103
A
If
B
When
C
Because
D
Although
 I was about to leave my house________the phone rang.
#72178
A
while
B
when
C
as
D
after
It was ____ the old worker came that we ____ the  experiment.
#73098
A
until; didn’t begin
B
not until; began
C
until; began
D
not until; didn’t begin