I didn’ t understand at first why he couldn’ t pass the test, no matter______har

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问题 I didn’ t understand at first why he couldn’ t pass the test, no matter______hard he had tried.

选项 A、when
B、where
C、what
D、how

答案 D

解析 how修饰副词hard，no matter how引导让步状语从句，故选D。

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