______,I could not memorize the long words

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______,I could not memorize the long words
A.However hard did I try B.However hard I tried C.No matter how I tried hard D.No matter how I had tried hard
麻烦你了

B.不管我如何努力,我都不能记住长单词.
这是一句状语从句,而且是让步状语从句（以“尽管、无论、即使”等词为标志）.
-ever 表示“无论...”（比如：whatever 无论什么、wherever 无论哪里）,引导让步性状语从句.
这类词语可以等于“no matter+ n ,如whatever=no matter what, wherever=no matter where .
however 是一个副词,表示“不管到什么程度；无论如何”,修饰hard.hard应该要紧跟在however后面,however hard 等于no matter how hard.但是前者可以引导让步性状语从句和名词性从句,后者只能引导让步性状语从句.
让步性状语从句中本身就带有点强调的意思在,无需借助did强调,排除A.
how并不能引导一个让步性状语从句,排除B
D表达法本身就有错误,应该是no matter how hard I had tried.

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