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

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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

解析本句为虚拟语气句，句子的时间状语为yesterday，所以本句考查对过去事情的虚拟。从句需要使用had done形式，主句需要使用would/should/could have done的形式。由此可以确定从句部分应填入come的过去分词形式had come。

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Iftheengineer(come)______hereyesterday，theproblemwouldhavebeensolved．had