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16..All of us know  _______ difficult the problem may be,we must work _____ out this evening.(  )
A.what; itB.whatever; thatC.how; thatD.however;it

分析 我们都知道不管这个问题多么难,我们必须今晚解决.

解答 答案是D.本题考查从句引导词;动词know引导的宾语从句中又出现了让步状语从句;从句中第一空需要的是引导让步状语从句修饰形容词difficult的副词,故排除A和B;根据语境"无论多么困难",故第一空选用however;第二空需要的是代替"the problem"的代词it,故答案是D.

点评 从句引导词的判断先要搞清从句的性质,掌握各引导词的用法,最后结合语境做出符合语法规则和逻辑的判断.

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