One can’t do extreme sports _________ he or she has had some training.
#31217
A
if
B
unless
C
once
D
since
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Just wait here, ______ you can hang around for a while. Your turn is half an hour away.
#30715
A
or
B
so
C
but
D
and
You can make a complaint to the local government ___ you are happy with the way they deal with the matter.
#31633
A
unless
B
if
C
once
D
as
All the photographs in this book，________ stated otherwise，date from the 1950s.(2012·陕西，25)
#30219
A
unless
B
until
C
once
D
if
Loulan City is not at all ________ a traveler who has never seen the desert before can expect.
#32335
A
that
B
where
C
what
D
which
The house _____ Mozart composed “The Magic Flute” is a museum now.
#34061
A
which
B
when
C
where
D
that