题目选项分析

During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution involved the large-scale introduction of enclosed fields, new farming techniques and crops, and of the substitution of commercial for subsistence farming.

During the eighteenth century, widespread changes in agriculture, known as the agrarian revolution, involved the large-scale introduction of enclosed fields and of new farming techniques and crops, and the substitution of commercial for subsistence farming.