Final answer:
The United Kingdom and its protectorates, France, and the Soviet Union.
Step-by-step explanation:
The countries that remained part of the Allied Powers in 1942 were the United Kingdom and its protectorates, France, and the Soviet Union.
The United Kingdom and its protectorates, including countries like Canada, India, and Australia, were key members of the Allied Powers.
France, despite being occupied by Germany, continued to have a government-in-exile and actively supported the Allies.
The Soviet Union played a vital role in the Allied Powers, especially on the Eastern Front, where they fought against the German forces.