GWD19有题不懂！急求教大牛！

傻熊有傻福

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



A.revolution, involving the large-scale introduction of enclosed fields, of new farming techniques and crops, and

B.revolution, involved the large-scale introduction of enclosed fields and of new farming techniques and crops, and

C.revolution, which involved the large-scale introduction of enclosed fields and of new farming techniques and crops, and

D.revolution involved the large-scale introduction of enclosed fields, new farming techniques and crops, and of

E.revolution that involved the large-scale introduction of enclosed fields and new farming techniques and crops, and of
答案是B，为什么并列的最后一个不加of呢？也就是说最后那个为什么不是并列呢？
谢！

Tobelogical

involved the large-scale introduction of enclosed fields and of new farming techniques and crops, and the substitution of commercial for subsistence farming
阴影部分并列。
另外，你可以从第一个红字and里面看出来，of并列的只有2个，否则不会3个并列部分，前两个就出现and

傻熊有傻福

involved the large-scale introduction of enclosed fields and of new farming techniques and crops, and the substitution of commercial for subsistence farming
阴影部分并列。
另外，你可以从第一个红字and里面看出来，of并列的只有2个，否则不会3个并列部分，前两个就出现and

-- by 会员 Tobelogical (2011/8/7 12:08:31)

懂了~非常感谢~