Both phones, yours and Laura's, ______ been ringing for hours.
Which of the following options correctly completes the sentence above?

Question

Quizplus · Accepted Answer

A subject must agree with its verb in number. The subject in this sentence (both phones) is plural, so we need a plural helping verb (have) to go in front of the main verb "been."
are is another form of the verb "been" (from "to be") so even though it is plural, it is not the appropriate verb to use here.
has and was are singular verbs, so would not be used with a plural subject.

Both Phones, Yours and Laura's, ______ Been Ringing for Hours