The NDRC has asked major Chinese oil companies, including China National Petroleum and China Petrochemical

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1. (2018高三上·北京月考) The NDRC has asked major Chinese oil companies, including China National Petroleum and China Petrochemical stable market pricing.

A . ensuring B . to be ensured C . to ensure D . having ensured

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备考2019年高考英语一轮复习11：非谓语动词