In the given question, a part of a sentence is printed in bold. Below each sentence, some phrases are given which can substitute the bold part of the sentence. Find out the phrase which can correctly substitute that part of the sentence. If the sentence is correct as it is, mark the answer as 'No correction required' or 'No Improvement'.
As John dived off the springboard, he was horrified to see that the water was drained from the pool the night before.
Had been drained off
As John dived off the springboard, he was horrified to see that the water had been drained off the pool the night before.