单项选择题

A.extractedB.emergedC.postedD.submergedCitric acid can ……

Citric acid can be （）from the juice of oranges，lemons，limes or grapefruit.

A.extracted
B.emerged
C.posted
D.submerged

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单项选择题When King George（），his brother succeeded him on the throne.

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A.exchanged
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A.discharging
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A.accused
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A.supervising
B.publicizing
C.recruiting
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