Which country?; The capital of it is...

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I'll try to make English sentences from Japanese ones.

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「東京は、どの国の首都でしょうか？」

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✍️ Of which country is Tokyo the capital?

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This sentence has been marked as perfect!

「東京が首都である国はどこでしょうか？」

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✍️ Where is the country that Tokyo is the capital of?

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✍️ Which is the country that Tokyo is the capital?

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This sentence has been marked as perfect!