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 题目和参考答案——青夏教育精英家教网—

题目内容

Only when he failed the exam ________ that he didn’t work hard. (原创)

A．he regretted

B．did he regret

C．had he regretted

D．does he regret

【答案】

【解析】略

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