Inthepastfewyears,researchhass

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更新 2022-09-03
科目英语
题型单选题
难度较易
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In the past few years, research has suggested that Vitamin D may increase the level of serotonin（血清素）, one of the key nurotransmitters influencing our mood, and ________it helps to relieve mood disorders.

A．that

B．where

C．what

D．which

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