to sunlight for too much time will do harm to one’s skin.
A．Being exposedB．Exposed
C．Having exposedD．After being exposed
A
考查非謂語動詞。句意：長時間日曬會對皮膚對不利。主語是being exposed to sunlight，謂語是will do harm to，賓語是skin，for too much time是定語。皮膚被曬傷，所以選擇被動，所以是C或者D。但是D不能做主語，因為它前面是個介詞，所以只能做狀語。
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