If a country specializes in producing a good for which it has a comparative advantage, it will always export that good and never import it under any circumstances.

The statement is false. Even if a country has a comparative advantage in a good, it may still import that good if domestic demand exceeds its production or if it needs a different quality or variety that it cannot produce efficiently. Trade can also be influenced by policy, tariffs, or strategic reasons, so a country might choose to import a good it can produce at a higher cost. For example, a country that grows rice cheaply could still import rice during a drought when its own harvest is low. Thus, specialization does not guarantee exclusive export and no import of that good.