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When was the hammock invented and by whom？A．The Indians had invented the hammock long befo
When was the hammock invented and by whom？
A．The Indians had invented the hammock long before they came to South America.
B．The Indians had invented the hammock long before the Europeans came to South America.
C．The Europeans invented the hammock after they made acquaintance with the Indians.
D．The Europeans had invented the hammock before they went to South America.
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