From the words or group of words lettered A to D, choose the word or group of words that best completes the sentence below. Although Sylvester and John prom...

Answer Details

The best word to complete the sentence is "neither." This is because "neither" is used to refer to two people or things and means "not the one nor the other of two." In this context, it means that neither Sylvester nor John has turned up despite their promise to be there.