问题补充：
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
答案：
A. As soon as
(答案→)B. Now that
C. Although
D. While
解析：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.
