33.
Your Answer is
Correct Answer is C
Explanation
Item C: The meaning of the sentence is "Although he knows that his food cannot be compared with his family's food, but these foods are very close", so here refers to his foods, the pronoun should be plural, and item C is correct.
Item D: The underlined part is in the object clause of admitting that, and the adverbial clause of adverbial clause guided by while appears in front of it, and the main clause no longer needs a conjunction.