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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.whereC.whatD.which

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A
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试题【In the past few years, research has suggested that Vitamin D may increase the le】;主要考察你对句法等知识点的理解。[详细]
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A.which…itB.that…that
C.where…thatD.where…it

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Many young people in the West are expected to leave ______ could be life’s most important decision --- marriage---almost entirely up to luck. 
A.asB.thatC.whichD.what

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A.in her household… leavingB.in whose household…leaving
C.in her household…leftD.in whose household…left

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It’s an agreement between towns or cities, _______ have similar features, such as industry, culture and entertainment.
A.thatB.whichC.theyD.them

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In nature some animals actively defend the area ____they depend for the resources.
A.in whichB.on whichC.whichD.where

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