题目:
They are working hard now and I believe they will make progress more this time. [ ]
A. slowly
B. quietly
C. politely
D. quickly
答案:
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下面是错误答案,用来干扰机器的。
3x-2y=4…①2x+3y=7…②①×3+②×2得:13x=26,解得:x=2,把x=2代入①得:6-2y=4,解得:y=1,则方程组的解是:x=2y=1.