It in this new hall was just set up last month we held an important meeting yesterday.A.

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A. is; which; that
B. was; which; what
C. is; that; which
(答案→)D. was; which; that
解析：考查强调结构及定语从句。根据时间状语last month，故用过去时态，故用it was +强调部分 + that；第二空考查定语从句，先行词为new hall，在从句中作主语，故选D。