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I didn't understand at first why he couldn't pass the test, no matter _________ hard he had tried.
A、when
B、where
C、what
D、how
【正确答案】：D
【题目解析】：【答案】D 【译文】起初我不明白为什么无论他怎么努力都考不及格。 【考点】状语从句 【解析】how修饰副词hard，no matter how引导让步状语从句，故选D。