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 invigilator had...

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 invigilator had hardly turned her back......the candidate was caught cheating

Answer Details

The most appropriate word that completes the sentence is "when". This is because "when" is a conjunction used to indicate the time at which an event or action occurs, and in the sentence, it shows the timing of the candidate being caught cheating. Thus, the sentence means that the invigilator had hardly turned her back when the candidate was caught cheating.