Twenty years have passed, I am glad to find the local people in some undeveloped areas are _________ than they were before.A.well offB.badly offC.worse offD.better off
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D解析 句意：二十年过去了，我很高兴地发现一些不发达地区的当地居民比他们以前富裕了。be well off 富裕，因为是和以前相比较，所以要用well 的比较级形式，即better。