2. 外语
  3. ______crude hydrocarbons into such products as gasoline and petrochemicals is at the heart of the petroleum industry.

______crude hydrocarbons into such products as gasoline and petrochemicals is at the heart of the petroleum industry.

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问题 ______crude hydrocarbons into such products as gasoline and petrochemicals is at the heart of the petroleum industry.
选项 A、Refine
B、Are refined
C、By refining
D、Refining
答案D
解析
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