Research shows that if we don’t __________ enough vitamin D, we will develop hea

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问题 Research shows that if we don’t __________ enough vitamin D, we will develop health problems.

选项 A、add to
B、put on
C、sum up
D、take in

答案 D

解析句意：研究表明，如果我们不摄入足够的维生素 D,将会出现健康问题。add to“增加，加强”，put on“上演，举办”，sum up“总结；概括”,take in“吸收；欺骗”。D项符合句意,故选D。

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