From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences. We have waited for ...

Answer Details

The correct answer is "left." The sentence is in the past tense, and "have waited" indicates that the waiting has been ongoing. "It's high time" is an idiomatic expression that means "it's time to do something." To complete the sentence, we need a past tense verb, so "left" is the correct choice. It means that we should have left a long time ago.