【題目】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：馬鈴薯被引入歐洲的時(shí)間不確定，但很可能是1565年。A. whether是否；B. why 為什么；C. how怎樣；D. when什么時(shí)候。 Exactly ______ the potato was introduced into Europe 是主語(yǔ)從句，根據(jù)后面的時(shí)間可知，前面是在說(shuō)時(shí)間，故選D。

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