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    精英家教网 > 高中英语 > 题目详情
    Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
    A．whetherB．whyC．when D．how
    C

    试题分析：考查主语从句的连接词。句意：准确的说，土豆是什么时候被传到欧洲的还不确定，但是可能在1565年左右。此处when引导主语从句并在从句中作主语。
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