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我从大全里找出了3个句子,都是正确答案:
1. Sunspots, vortices of gas associated with strong eletromagnetic activity, appear on the surface of the sun as dark spots, although never sighted at the sun's poles or equator. (were never sighted)
2. Most energy analysts now agree that the costs of building and maintaining nuclar reactors are so high that nuclear power is unlikely to prove cheaper than coal or oil in the long run. (to be proven)
3. The man was always aware, sometimes proudly and sometimes resentfully, that he was a small-town Midwesterner thrust into a world dominated by wealthier, better-educated and more polished people than he. (being thrust)
我想问的是,为什么括号里的相对应的被动的说法都不对? 这种转化成主动有什么规律吗?
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