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

【答案】C
【解析】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),選C。

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