Rock-climbing is a breathtaking activity, very popular nationwide among young people, ______ cooperation as well as courage plays an important role.
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A
who
B
where
C
which
D
of which
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David, _____ I have been sharing a dorm for more than two years, is quite a funny guy.
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A
of whom
B
with whom
C
in whom
D
from whom
Jim passed the driving test , ________ surprised everybody in the office.
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A
which
B
as
C
it
D
that
She brought with her three friends，none of ________ I had ever met before.
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A
them
B
who
C
whom
D
these