问题
选择题
| Only when he failed the exam ______ that he didn't work hard. |
| A. he regretted B. did he regret C. had he regretted D. does he regret |
答案
答案：B
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| Only when he failed the exam ______ that he didn't work hard. |
| A. he regretted B. did he regret C. had he regretted D. does he regret |
答案：B