If Country A has a comparative advantage in wheat production and Country B has a comparative advantage in cloth production, it is true that Country A will never import cloth from Country B under any circumstances.

It's not true that Country A will never import cloth from Country B. Even though Country A is better at producing wheat and Country B is better at making cloth, both countries can benefit from trade. By specializing in what they do best, Country A can produce more wheat, while Country B can produce more cloth. Then, they can trade some of their goods, allowing each country to get what they need more efficiently. For example, if Country A trades wheat for cloth with Country B, both countries end up with more wheat and cloth than if they tried to produce both items themselves.