I should (know) ______ it wouldn’t be easy.have known本题考查虚拟语气的用法。should have don

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问题 I should (know) ______ it wouldn’t be easy.

选项

答案 have known

解析本题考查虚拟语气的用法。should have done结构表示虚拟语气，意思是“应该做某事(但事实上没做，或没做成)”，句子暗含的意思是“我之前不知道，或没料想到”。

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