The police were seeking more information to find out _____ the rich merchant.   [ ]

A. who was it that killed                

B. who it was that killed    

C. it was who killed                    

D. who was it killed

图是“某城市规划简图”，读图回答下列问题。

小题1:将图中的符号与其代表的工业类型用线连接起来。

小题2:假如你是一名房地产开发商，将在该城市的a、b、c、d四个地块中选一处建设高级住宅区，________处最合适，并简要说明你选择的理由：________________________。

小题3:该市计划在甲、乙、丙、丁四地中选择一处建设精密感光仪器厂，你认为最合适的厂址应位于________处，请简述你选择的理由。