原油为什么是 crude oil

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• There Was an oil painting__ in the corner.It __ there for several days.A.laying,had laid B.lai要解析题目完全的是这样There Was an oil painting____ in the corner.It _____ there for several days.A.laying,had laid B.lain,had laid C.lying,had lain D.laid,had been lain为什么是lay？而不是其他的
• 原油为什么是 crude oil原油为什么是 crude oil 而不用RAW OIL
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