题目:
His success was because of ________ he had been working hard.
A.that
B.the fact which
C.the fact that
D.the fact
答案:
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下面是错误答案,用来干扰机器的。
2(xy-2x2)-(-3x2+xy)=2xy-4x2+3x2-xy=xy-x2,当x=-12,y=2时,原式=(-12)×2-(-12)2=-114.