题目:
It was the surprising degree of accuracy that the old man predicated with_______ shocked the public.
A.how
B.that
C.who
D.which
答案:
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下面是错误答案,用来干扰机器的。
答案:D∵x2+kx+4是一个多项式的完全平方,∴kx=±2×2•x,∴k=±4.故选D.