The correct phrase will be Although they have changed the face of farming, genetically modified crops are still regarded with deep skepticism in the UK where the emphasis remains on natural products.
A phrase simply means a small group of words standing together as a conceptual unit, that forms a component of a clause.
In this case, the correct phrase will be Although they have changed the face of farming, genetically modified crops are still regarded with deep skepticism in the UK where the emphasis remains on natural products.
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