A) Keeping
B) Difficult
C) Persons
D) Elderly
Correct Answer: C
Solution :
"Persons" is a plural noun. "Keeping" (A) is the gerund form of a verb in this sentence (i.e. it functions as the subject like a noun, but it is not a noun). "Difficult" (B) is an adjective modifying the noun phrase "Keeping warm in the winter." "Elderly" (D) is an adjective modifying the noun "persons."You need to login to perform this action.
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