Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
A．whetherB．whyC．when D．how
C

試題分析：考查主語從句的連接詞。句意：準(zhǔn)確的說，土豆是什么時候被傳到歐洲的還不確定，但是可能在1565年左右。此處when引導(dǎo)主語從句并在從句中作主語。
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