They ______ on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far.

A．had been working; are still working

B．had worked; were still working

C．have been working; have worked

D．have worked; are still working

某责任区刑警一队侦查员小王，在案件侦查中的回避，应由（）决定。

A、公安局长

B、刑警大队长

C、刑警中队长

D、探长