"Put some salt on the water and then mix( )up" 括号内是填them还是it?是选them还是it呢?

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"Put some salt on the water and then mix( )up" 括号内是填them还是it?
是选them还是it呢?

them,因为是把“water”和“salt” 两样东西混合

A.mix it up B.mix them up A them,因为这里指把糖和水混合。 B,them