单项选择题
21（）
A. there
B. they
C. it
D. that
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单项选择题
The world's oil supply
A．haven been gradually being exhausted
B．is being gradually exhausted
C．is gradually exhausted
D．has gradually exhausted
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单项选择题
The majority of our students ______the life of these native people.
A．have never heard of
B．has heard about
C．has never heard of
D．have never listened to
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