GWD28-41

jmbnzhu

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

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I cannot understand why the answer is B not D.

Thank y

georgetseng

B)中：
involve x, and y
x = introduction of x1 and (of) x2；x1=enclosed fields, x2 = new farming techniques and crops
y = the substitution of commercial for subsistence farming

D)中：
 involved x, and y
x  = introduction of a； a = enclosed fields and new farming techniques and crops； a如果是一个整体，意思上说不过去。如果是两个东西，a1 = enclosed fields, b1=new farming techniques and crops，那么应改为， introduction of enclosed fields, of new farming techniques and crops
y = (introduction) of b； b = the substitution of commercial for subsistence farming => introduction of substitution 意思不对
所以D)中involve一词后的短语整个就是逻辑混乱。
另外，revolution和that之间要加个逗号（但这不是主要考点）。

jmbnzhu

Thank you