单项选择题

A．The book has been sold.
B．The book has been lost.
C．The book has been reserved.
D．The book has been borrowed by the professor.
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单项选择题
A．Sewage and industrial waste.B．Oil pollution on the beach.C．Oil discharged at sea when people cleaning oil tanks.D．The oil that leaks out after ship collisions.
A．Sewage and industrial waste.
B．Oil pollution on the beach.
C．Oil discharged at sea when people cleaning oil tanks.
D．The oil that leaks out after ship collisions.
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