Answer:
The revision that uses a phrase to combine the last two sentences is:
A. Constructing this new state-of-the-art swimming facility will take two years.
Step-by-step explanation:
A phrase is a group of words that stand together and express a concept. A phrase is often a part of a sentence or a clause. This question wants us to find the revision that combines two sentences by using a phrase. The best option is letter A:
Constructing this new state-of-the-art swimming facility will take two years.
The highlighted section above is the a phrase resulting from combining the two sentences. All the information necessary from both sentences was put together to form the subject of this revised sentence.