单项选择题
下列划线处不同的是()
A.f
ou
nd
B.c
ou
ld
C.sh
ou
ld
D.w
ou
ld
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下列划线处不同的是()
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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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