20.
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.