试题与答案

His success was because of ________ he h

题型:选择题

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.

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