Выберите подлежащее этого предложения:
That a radio message from civilizations on some of the planets should reach the Earth is quite possible.

That
That a radio message from civilizations on some of the planets
That a radio message from civilizations on some of the planets should reach the Earth

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Выберите подлежащее этого предложения:That a radio message from civilizations on some of the planets should reach the Earth is quite possible.