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发布时间:2023-10-04 11:54:21

[单项选择]The starting point for the formation of petroleum is-------that has accumulated in die sediments on the ocean floor.
A. marine plankton has decayed
B. the decay of marine plankton
C. when decaying marine plankton
D. marine plankton, the decay of which

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[单项选择]The petroleum exploration and production companies hold a wait-and-see attitude despite of the price rise because ______.
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