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______crude hydrocarbons into such products as gasoline and petrochemicals is at
______crude hydrocarbons into such products as gasoline and petrochemicals is at
游客
2025-02-04
48
管理
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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