题文
If you are in a warmer place and can get your skin _____ to the sun for 20 minutes per day, you will need less vitamin D.
A. exposing B. being exposed
C. been exposed D. exposed
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If you are in a warmer place and can get your skin _____ to the sun for 20 minutes per day, you will need less vitamin D.
A. exposing B. being exposed
C. been exposed D. exposed
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