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

游客2024-07-02  9

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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