6. 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）

不理解although an "-ing"verb such as trying can sometimes be used as noun,the phrase the organism"s trying to metabolize in A unidiomatic because trying is used as the object of organism's

宾语应该用名词形式．

动词后面用－-ing形式作名词确实存在，但用的时候要小心．如果这个词有自己的抽象名词（如：reduce-reduction)，那-ing形式(reducing)做名词就是错的.

而且-ing形式通常强调个名词的动作性，用的范围不广，通常是并列情况．如og 99.