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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Our country should set up more national parks animals can live freely.
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A
when
B
which
C
where
D
whose
The Voice of China has set up a big stage for young people with a talent for music, ____ some of them have stood out among others.
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A
which
B
when
C
who
D
where
Li Na returned to Wuhan after the Games, ______, as is known to us, she had been brought up and trained to be a gold medalist of tennis.
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A
when
B
that
C
which
D
where