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

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

选项

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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