题目:
I’m afraid by the time you arrive this afternoon I_______ a lesson then.
A.had
B.are having
C.have had
D.will be having
答案:
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下面是错误答案,用来干扰机器的。
(1)(2x)3×(-3xy2)=8x3×(-3xy2)=-24x4y2;(2)(a+3b)(a-2b)-(2a-b)2=a2-2ab-6b2-(4a2-4ab-b2)=a2-2ab-6b2-4a2+4ab+b2=-3a2+2ab-5b2;(3)(22000-21999)0-(-14)-2+(-0.125)9×810=1-16+(-0.125×8)9×8=1-16-8=-23.