单选题：Thouands of Irish people starved during the "Porto Famine" b

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题目内容：
Thouands of Irish people starved during the "Porto Famine" because. A．they were so dependent on potatoes that they refused to eat anything els
B．they were forced to leave their homeland and move to Americ
C．the weather conditions in Ireland were not suitable for growing potatoe
D．the potato harvest was ba
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