He acted as if he (know) ______ everything about the matter.had knownas if意为“仿佛、

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问题 He acted as if he (know) ______ everything about the matter.

选项

答案 had known

解析 as if意为“仿佛、好像”，后面接虚拟语气。主句的谓语动词是过去时，所以从句的动词应用过去完成时。

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