Почему правильно будет поставить Present Perfect во втором предложении ?
A floating city may sound crazy but as it affects of climate change become worse ,people are thinking seriously about even unusual ideas. A group called Oceanix HAS CAME up with a plan to create the first floating city.
A floating city may sound crazy but as it affects of climate change become worse ,people are thinking seriously about even unusual ideas. A group called Oceanix HAS CAME up with a plan to create the first floating city.
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