Question

Both the computer screen and the refrigerator door have _____ smeared with dog snot from our curious puppy Oreo.
? its shiny surface
? their shiny surfaces

Answer 1

The correct option is "their shiny surfaces." The sentence should read: "Both the computer screen and the refrigerator door have their shiny surfaces smeared with dog snot from our curious puppy Oreo." This is because "both" refers to two items (the screen and the door), so the plural possessive "their" is appropriate.