He told as if he knew everything.还是He told as if he had known everything.
问题描述：
He told as if he knew everything.还是He told as if he had known everything.
答
He told as if he had known everything.
因为前面用了过去时,told, 所以后面要用过去完成时 (had known)
答
He told as if he had known everything.
以as if (as though)引导的方式状语从句或表语从句，有时用虚拟语气，若表示与现在事实相反，谓语动词用一般过去时；若表示与过去事实相反，用过去完成时
答
as if 和 as though引导的从句,与现在相反,用一般过去时;与过去相反,用过去完成时,所以本题”told”与过去相反 应该用“had known"为宜.(觉得不错的话要给我加分哦!）
答
He told as if he had known everything.
完成事态“更好些”。