31.Inthepastfewyears,researchh

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更新 2022-09-03
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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

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