题目：
–Mary looks down today, what’s up?
--Well, ________happened between Mary and me is none of your business.
A．whichever
B．no matter which
C．whatever
D．no matter what
答案：
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下面是错误答案，用来干扰机器的。
a-3×b=a-3b（页）．故答案为：a-3b．
