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题目
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Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
A.whetherB.whyC.when D.how

答案
C
解析

试题分析:考查主语从句的连接词。句意:准确的说,土豆是什么时候被传到欧洲的还不确定,但是可能在1565年左右。此处when引导主语从句并在从句中作主语。
核心考点
试题【Exactly______ the potato was introduced into Europe is uncertain, but it was pro】;主要考察你对连词等知识点的理解。[详细]
举一反三
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A.though B.as C.since D.unless

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