423. In virtually all types of tissue in every animal species, dioxin induces the production of enzymes that are the organism’s trying to metabolize, or render harmless, the chemical that is irritating it.

(A) trying to metabolize, or render harmless, the chemical that is irritating it

(B) trying that it metabolize, or render harmless, the chemical irritant

(C) attempt to try to metabolize, or render harmless, such a chemical irritant

(D) attempt to try and metabolize, or render harmless, the chemical irritating it

(E) attempt to metabolize, or render harmless, the chemical irritant

答案是E，没有问题。请教A，D中it指代问题：it在意思上我觉得指代organism，但是以前ecsniffer说：代词 it / they 只能指代真正的名词形式，连 名词1's 名词2 结构中的 名词1 都不能指代，

按照这个原则，这里的it指代是不对的。请NN确认

1. Inflation in medical costs slowed in 1986 for the fifth consecutive year but were still about 50 percent greater than the rate of price increases for other items included in the consumer price index.

(A) Inflation in medical costs slowed in 1986 for the fifth consecutive year but were

(B) Inflation in medical costs slowed for the fifth consecutive year in 1986 but was

(C) In 1986 inflation in medical costs were slowed for the fifth consecutive year but were

答案是B，主谓一致排除的。没问题。

我想问：如果将A，C中的were全部改为was后，A，C对吗？？in 1986这个状语放在哪里好？？

1,it=dioxin

2,看不出A，B，C的区别。C改为was slowed。

1名词's这里的名词其实是充当定语的，相当于adj所以是不能用it /they指代的

2C不对，改变了in 1986修饰的对象.C修饰全句，A，B都查不多，一个时间状语一个同位语补充说明，个人感觉。