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【单选题】
All of the following are mentioned in Paragraph 4 as results of the introduction of the heavy plow EXCEPTA.
a rise in trade with the peoples of Eastern Europe.
B.
a change in the standard shape of farm fields.
C.
an increase in the communal undertakings of farmers.
D.
a decrease in the time needed to prepare fields for planting.
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A.
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B.
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C.
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D.
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