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15.I've come to learn that the best time to debate with family members is               they have food in their mouths.(  )
A.howB.whenC.whetherD.that

分析 我已经认识到与家庭成员辩论的最佳时间是他们嘴里在吃东西的时候.

解答 答案是B.
本题考查表语从句中的引导词;题干中is后面的表语从句;how 表示方式"如何";when表示"时间"; whether是否;that在名词性从句中不担任成分、无意义;根据上文the best time和句意可知,最佳时间是家人在吃东西的"时候",故答案是B.

点评 名词性从句考查的关键是连接词的选用和语序,因此,我们首先要搞清从句的性质,掌握各连接词的用法,在此基础上判断.此外,关注名词性从句用陈述语序.

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