If the doctor (come) ______ earlier last night, Nina would be alive today.

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问题 If the doctor (come) ______ earlier last night, Nina would be alive today.

选项

答案had come

解析 本题考查的是if引导的条例状语从句中虚拟语气的使用。表示与过去事实相反的假设,所用的句式为: if+主语+had done,主语+would/should/could/might + have done。本句中从句表示的是过去时间,主句表示的是现在时间,因此也称错综虚拟语气。
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