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31. In the past few years, research has suggested that Vitamin D may increase the level of serotonin(血清素), one of the key neurotransmitters influencing our mood, and ________it helps to relieve mood disorders.

A.that B.where C.what D.Which
科目 英语   题型 单选题   难度 较易
知识点: 从属连词
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