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  3. ________the potato was introduced into Europe is uncertain, but it was probably around 1565.

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

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问题 ________the potato was introduced into Europe is uncertain, but it was probably around 1565.
选项 A、Where
B、When
C、That
D、Why
答案B
解析 分析句子结构并结合句意可知，空处引导的是一个主语从句，在从句中作时间状语，所以应用连接副词When引导。where在主语从句中作地点状语；that在主语从句中不充当任何语法成分，只起连接作用且无词义；why在主语从句中作原因状语，这三项均不符合题意。故选B。
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