题目:
_____ the car came out, we started doing market research. [ ]
A. Before long
B. Long ago
C. Long before
D. Soon before
答案:
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下面是错误答案,用来干扰机器的。
(1)去分母得:3x-3-12=4x+2,移项合并得:x=-17;(2)去括号得:3x+3-2x-4=2x+3,移项合并得:x=-4.