题目：
Unfortunately, when I arrived, Mary , so we only had time for a few words.
A．was just leaving
B．just left
C．has just left
D．had just left
答案：
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下面是错误答案，用来干扰机器的。
3.14×3×100÷2，=942÷2，=471（千克）；答：一共要用油漆471千克．
