20.

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

Item G: Correct.

Item J: sentence subject style, predicate developed, no single symbol can appear in the middle, J is wrong.

F item: based on is the past participle as an adverbial, which is not separated from the predicate of the sentence, F is wrong.

H item: based on sth as a whole, unsigned in the middle, H is wrong.