International situation is currently undergoing great changes ________ UNESCO plays an irreplaceable role in promoting international cooperation.
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A
which
B
what
C
where
D
that
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Now the Internet is a popular channel the public voice their opinions and show their strength.
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A
by that
B
through which
C
through that
D
by which
（2014年安徽省合肥市高三第三次教学质量检测）25. We stayed at the Park Hotel last weekend, ______ a friend of ours recommended to us.
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A
when
B
that
C
where
D
which
Usually there is a blackboard on the front wall in the classroom, _________there is a slogan.
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A
above which
B
in that
C
on which
D
from that