Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.

A. whether B. whyC. when D.how

 

C

【解析】

試題分析：考查主語(yǔ)從句的連接詞。句意：準(zhǔn)確的說(shuō)，土豆是什么時(shí)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(yǔ)從句并在從句中作主語(yǔ)。

考點(diǎn)：考查主語(yǔ)從句的連接詞。

 

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