The river, ________ the banks are covered with trees，is very long.
#31926
A
whose
B
which
C
of which
D
which of
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Then arose the question _________ we were to get so much money.
#34680
A
where
B
that
C
about which
D
in which
You will be successful in the interview ____ you have confidence.
#79978
A
before
B
once
C
until
D
though
I had walked a few steps _______ I realized that I was lost in the thick fog.
#80162
A
unless
B
Before
C
When
D
since
The students of the music school study ____.
#31664
A
music but also some other subjects
B
some other subjects as well as music
C
no subjects but music
D
neither music nor some other subjects