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C
试题分析:考查连词和省略句:A. as当…时候,因为,正如,B. unless除非,C. if如果,D. before在…前面,句意:上个月这个城市的房屋销售下降了40%,如果不算上为贫穷居民提供的廉价房是48%。这句话是省略句,完整的是:The sales of houses in our city fell by 40 percent last month, The sales of houses in our city fell by 48 percent if we don’t count low-price houses provided for poor residents.选C。