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单选题回答31题：

参考答案：A进入在线模考
“run”和“operate”都可以表示“经营”的意思，但是“run”更为地道一些，该题应该选run的过去分词形式。故选A。

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1Questions :
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2回答32题：

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3What is the first stage of quality control?

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