问题
选择题
—Believe it or not, I have met him before.
—No kidding? ________ you've never mentioned it?
A．What for
B．How come
C．How about
D．What if
答案
答案：B
B考察交际用语；句义：—不关你信不信，我以前见过他。—真的吗？你怎么从来没有提过啊？A为何目的？Ｂ为什么？怎么会？C怎么样：D要是…又如何？根据句义说明B正确。