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单选题
4.the potato was introduced into Europe is uncertain, but it was probably around 1565.
A
A. Where
B
B. When
C
C. That
D
D. Why
答案解析
正确答案：B
解析：
4.【翻译】 土豆是什么时候被引入欧洲的还不确定，但很可能是在1565年左右.【精析】B分析句子结构可知，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在主语从句中只起连接作用，不充当语法成分且无词义；why在主语从句中作原 因状语。故选B
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