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1.Before taking measures to solve the problem,it is necessary for us to know     the problem itself is.(  )
A.whatB.thatC.whichD.why

分析 在采取措施解决问题之前,了解问题本身是什么对于我们来说是很有必要的.

解答 答案:A.
在本句中know后面的成分为一个宾语从句,从句中is后面缺少一个表语,所以用what来引导,what在引导宾语从句时是可以充当一定成分的,that引导名词性从句时不作成分,which引导宾语从句时多强调范围,why引导宾语从句时多作状语,均可排除;故选A.take measures to do sth意为采取措施做某事,it为形式主语,后面的不定式作真正主语.

点评 对于宾语从句的引导词要分清他们的作用和在从句中是否充当成分,充当何成分等.

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