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

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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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