The single family house has constructed by the Yana, a Native American people who lived in what is now Northern California, was conia in shape, its framework of poles laid with slabs of bark, and banked with dirt to a height of 3 to 4 feet.
其中我选了个 dirt as high as 3 to 4 ft. 错的
但原句为什么正确呢？
Technology has allowed manufacturers to make small cars more fuel- effecient than those at any time in their production history.
I choose the original sentence,
but the correct one puts: small cars that are more effecient than those in
还请NN再指点，我要说 他们被允许生产的汽车比那时候多 怎么说？
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