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Selling a product with no known or even _______ substitute and with an ever-growing demand for it seems as if it would be quite lucrative, but in fact the three biggest private-sector water companies in the world are eager to get out of the business.
- A.recognized
- B.practicable
- C.profitable
- D.acknowledged
- E.imaginable
- F.conceivable
E,F显示答案
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以上解析由 考满分老师提供。
