The house, we bought last month, is very nice.A. whereB. that C. whichD. when

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A. where
B. that
(答案→)C. which
D. when
解析：考查非限制性定语从句，先行词是the house，定语从句缺少宾语，因为非限制性定语从句不能用that引导，选which，句意：我们上个月买的房子很好。选C。