单项选择题

A．They were influenced by his background in engineering.
B．They were very expensive to take.
C．They were among the first taken under such condition.
D．Most of them were of poor quality.
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单项选择题
A．Putting a roof on a barn.B．Harvesting water reeds.C．Using stone as a building material.D．Daily farm operations.
A．Putting a roof on a barn.
B．Harvesting water reeds.
C．Using stone as a building material.
D．Daily farm operations.
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