_______naturally by the skin when exposed to sunlight, Vitamin D is needed for healthy bones, teeth ...
2022-09-25 18:51:35 132次 北京市海淀区2018届高三二模英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
_______naturally by the skin when exposed to sunlight, Vitamin D is needed for healthy bones, teeth and muscles.
A. Making B. To make
C. Made D. Make
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