it is D, the absolute phrased is used here -> full phrase is "thousands of mobiles homes USED to....", the noun can be redundant
A are B are incorrect because "to" does not express the purpose of mobiles homes
I doubt that this question will be tested in real gmat because there is no clear source.
A are B are incorrect because "to" does not express the purpose of mobiles homes
I doubt that this question will be tested in real gmat because there is no clear source.




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