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 teacher had har...

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 teacher had hardly turned his back...........the class became noisy

Answer Details

The correct answer is "when". The sentence implies that the class became noisy immediately after the teacher turned his back. The word "when" is used to indicate a time-related cause-and-effect relationship, which fits the context of the sentence.