The meeting _______for two hours, but they still ______any agreement.

A．has been going on; haven’t reached.

B．has been going on; haven’t been reached.

C．was going on; haven’t reached

D．was going on; haven’t been reached

把有限的卫生资源配置到最能产生社会效益和经济效益的做法是体现（）。

A.公平公正原则

B.优先原则

C.效率、效益原则

D.价值原则

E.不伤害原则