______ you have known everything about it, it is unnecessary for me to talk about it again.A.As soon asB.Now thatC.AlthoughD.While
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B解析试题分析：句意,既然你已经知道了一切，我就没有必要再谈论它了。as soon as 一……就; now that 既然; although尽管; while然而.故选B.考点：连词辨析
点评：解答此类题型首先要确定上下句关系,根据前后文关系确定适当连词. as soon as 一……就; now that 既然; although尽管; while然而