Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.A.

题目简介

Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.A.

题目详情

Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
A.whetherB.whyC.when D.how
题型:单选题难度:中档来源:不详

答案

C

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。

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