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

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A. what; that
(答案→)B. which; that
C. that; which
D. which; who
解析：考查定语从句和强调句型。It is/was...that是强调句型，可以强调除谓语以外的任何成分，去掉强调句型后，句子仍然是完整的；本题中，强调句型中包含了一个定语从句。从句     was just set up last month缺少主语，说明第一空后是定语从句，this new hall是先行词，定语从句不能用what，排除A；去掉第二个空和It was之后，句子变为We held an important meeting in this new hall (that was just set up last month) yesterday.句意是完整的，因此，第二空用that构成强调句，故选B。