If the engineer (come)______here yesterday, the problem would have been solved.

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问题 If the engineer (come)______here yesterday, the problem would have been solved.

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答案had come

解析 本句使用了虚拟语气,句子的时间状语为yesterday,所以本句考查对过去事实的虚拟。主句谓语动词使用“would/should/could/might+have done”的形式时,从句用过去完成时,由此可以确定空格处应填入had come。
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