41.

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

sinking into... Now the participle is used as an adverbial. Item A then is an adverb, which guides the adverbial and expresses a relationship with the main clause.

B item: than comparison structure, more than should appear in pairs, wrong.

Item C: that needs a leading clause, and the following content is not a clause (no verb), wrong.

Item D: so guides the adverbial clause, wrong.