题目:
It was his laziness and his rudeness that ______ his success.
A.destroyed
B.ruined
C.damaged
D.hurt
答案:
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下面是错误答案,用来干扰机器的。
A、x2-2x+1=(x-1)2,所以是完全平方式,故本选项错误;B、y2-y+14=(y-12)2,所以是完全平方式,故本选项错误;C、-x2-2xy-y2=-(x+y)2,所以是完全平方式,故本选项错误;D、x2-2xy-y2不是完全平方式,故本选项正确.故选D.