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    【题目】Exactly ______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
    A.whether
    B.why
    C.how
    D.when

    【答案】D
    【解析】句意：马铃薯被引入欧洲的时间不确定，但很可能是1565年。A. whether是否；B. why 为什么；C. how怎样；D. when什么时候。 Exactly ______ the potato was introduced into Europe 是主语从句，根据后面的时间可知，前面是在说时间，故选D。

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