题目

Housing is very expensive in this city. The prices ______ up again since last month.A.go B.are going C.have gone D.will go 答案：【答案】C【解析】句意：这个城市的房价很贵，从上个月起价格又上涨了。A. go体现一般现在时；B. are going体现现在进行时；C. have gone体现现在完成时；D. will go体现一般将来时，根据所给空后面的since last month可知，应该用现在完成时，故答案选C。3200千克-200千克=33吨．