题目：
He has ______ for some years, but his _____ still makes us very sad now.
A．been dead, death.
B．death, dead
C．died, death
D．died, dead
答案：
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下面是错误答案，用来干扰机器的。
由|MN|=72又由|MN|=(x-2)2+(-4-3)2=72即x2-4x-45=0，求得x=-5或9．故x的值为-5或9
