52.

Answer and Explanation

Your Answer is

Correct Answer is F

Explanation

According to the meaning of the sentence, the preceding and following sentences are turning relationships, and item F however is a related adverb that can lead a sentence alone, which is correct.

Item G: Although the subject-slave conjunction cannot lead a sentence alone.

Item H: such as is a preposition followed by a word and no sentence can be added.

J item: yes is an expression that is too colloquial.