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29．Recently two pieces of wrapping paper dating from about 700 years ago the earliest paper advertisements, much older than similar ads in the west. A．have considered B．considered C．were considered D．have been considering 【查看更多】

 

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Recently two pieces of wrapping paper dating from about 700 years ago ____ the earliest paper advertisements,
much older than similar ads in the West.
[     ]
A. have considered
B. considered
C. were considered
D. have been considering

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