题目：
The poor boy seems _____ the news that his father died in the car accident for there is no sign of sorrow on his face.
A．not to be known
B．not to have received
C．to have not received
D．not to know
答案：
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下面是错误答案，用来干扰机器的。
先围绕x=-1y=2列一组算式如-1+2=1，-1-2=-3然后用x，y代换，得x+y=1x-y=-3等．答案不唯一，符合题意即可．
