OG 12th 81题关于not的位置，求各位NN解答~

记得当时

OG 12th Q81:
Recently physicians have determined that stomach ulcers are not caused by stress, alcohol, or rich foods, but a bacterium that dwells in the mucous lining of the stomach.

A. not caused by stress, alcohol, or rich foods, but
B. not caused by stress, alcohol, or rich foods, but are by
C. caused not by stress, alcohol, or rich foods, but by
D. caused not by stress, alcohol, and rich foods, but
E. caused not by stress, alcohol, and rich foods, but are by

我明白答案应该选C，但是如果B选项by前面的are去掉，是不是也可以选呢？not caused by stress, alcohol, or rich foods, but by

HerringtonD

在语法上可以算是正确
但是相对C还是不能选
因为C更简洁

Eeeehong

在动词前面加上not的，是对该动词否定；
而在后面的不定式加上not的，是对不定式的内容否定，没有对谓语进行否定

例：stomach ulcers are not caused by stress, alcohol, or rich foods
这句话的含义是“通过压力、酒精、食物，胃溃疡并没有导致”（对“caused”动词进行否定，说明根本没有胃溃疡发生这件事）
      stomach ulcers are caused not by stress, alcohol, or rich foods
这句话的含义是“胃溃疡的导致，不是因为压力、酒精、食物”（对后面的因素进行否定，说明胃溃疡发生了，但是原因比并不是以上的因素）

例： the motion picture was not first developed to entertain，表明的含义是“最先开始没有发展”
       the motion picture was first developed not to entertain，表明的含义是“最先开始发展了，但是发展的目的不是为了娱乐”

以上为个人理解~