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7._____he will come to help us is not clear.(  )
A.ThatB.WhetherC.EitherD.What

分析 他是否会来帮助我们还不清楚.

解答 答案为B.本题考查名词性从句中引导词的运用.题干中is前为主语从句,空格处需要的是引导主语从句的引导词,either不引导名词性从句,故排除C;由下文中not clear判断句中需要疑问意义的引导词,that不表示疑问,故排除A;What在从句中做主语或宾语,但是本题主语从句中成分完整,所以用不担任成分的whether表示"是否",故选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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