【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】

試題分析:句意:馬鈴薯被引入歐洲的時間不確定,但很可能是1565年。A. whether 是否;B. why 為什么;C. how 怎樣;D. when什么時候。Exactly ______ the potato was introduced into Europe是主語從句,根據(jù)后面的時間可知,前面是在說時間,故D

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