2. 专升本
  3. I didn’t understand at first why he couldn’t pass the test, no matter______hard he had tried.

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

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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
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