Задача Задача №3055953
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Решение:
Dima has been to a Russian city - Option 3. The letter mentions Dima's trip to Moscow, which is the capital city of Russia. The landmarks he describes such as the Kremlin, St. Basil's Cathedral, Red Square, and the Moscow Metro are all located in Moscow, confirming that he visited a Russian city.
Therefore, the correct answer is Option 3: a Russian city.