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: The students have n...

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:
The students have not come back from their school farms,............?

Answer Details

The best option to complete the sentence is "have they". This is because the sentence is asking a question about the current whereabouts of the students, so it requires the present tense of the auxiliary verb "have" to form a present perfect tense question. The other options are in past tense or don't form a question.