______ you have known everything about ...

______ you have known everything about it, it is unnecessary for me to talk about it again.

A．As soon as

B．Now that

C．Although

D．While

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

考点分析：

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