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.

admin2019-07-01  61
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
转载请注明原文地址:https://kaotiyun.com/show/7cfO777K
0

托福（TOEFL）

相关试题推荐
随机试题
最新回复(0)