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He tried his best to slove the problem,_A___difficult it was

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He tried his best to slove the problem,_A___difficult it was.
A.however B.whatever C.no matter D.although
B,D为什么不行,它们有什么区别
He tried his best to slove the problem,_A___difficult it was
梦之南草的回答简直可笑,只知道死记硬背书本知识.
however此处是“无论多么”的意思,接形容词
whatever 无论什么,本身就是名词,不能接其他成分
no matter 后面要加how才构成“无论多么”的意思,和however用法相同
although后的语序不能倒装,应是although it was difficult
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