He made another wonderful discovery, _______ of great importance to science.
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A
which I think is
B
which I think it
C
which I think it is
D
I think which is
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In 2004, he went to Oxford University __________ he became interested in Chinese culture.
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A
which
B
that
C
whose
D
where
My neighbors used to give me a hand in time of trouble, _______ was very kind of them.
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A
it
B
who
C
that
D
which
Rock- climbing is a breathtaking sport， courage plays an important role.
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A
which
B
whose
C
where
D
when
St Petersburg, is a very beautiful city, was once called Leningrad.
#75056
A
which
B
where
C
that
D
what