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A sentence has been given with blanks to be filled with appropriate prepositions. Choose the correct alternative. When our skin is exposed the sun, ultraviolet rays convert a precursor molecule called 7-dehydrocholesterol vitamin D3.

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A sentence has been given with blanks to be filled with appropriate prepositions. Choose the correct alternative. When our skin is exposed ________ the sun, ultraviolet rays convert a precursor molecule called 7-dehydrocholesterol ________ vitamin D3.