高中英语题求解有疑问谢谢.
???thehousingprice,severalmeasureshavebeenadoptedinthelasttwoyears.AloweringBhavingloweredCtolowerDtohavelowered.各位同学们能告诉我选什么吗?还有个问题要问问...havingloweredthehousingprice,themeasureshavebeenproveddefective.这个为什么要用havinglowered?求解,谢谢,虚心求教.
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