If we (know) ______ the basic principles, we should have controlled the process

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问题 If we (know) ______ the basic principles, we should have controlled the process even better.

选项

答案 had known

解析若是能早知道这些基本原则，我们就能更好地控制其中的进程。虚拟语气非真实条件句中，主句用“should have+过去分词”，条件从句用“had+过去分词”。

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