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

A.is; which; that

B.was; which; what

C.is; that; which

D.was; which; that

答案及解析： D

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。