—Did Jim come?

—I don’t know. He _______ while I was out.

A．might have come

B．might come

C．mush have come

D．should have come

要加强对（）防治政策措施落实情况的监督检查，对不认真履行环保职责、严重损害群众环境权益的地方和单位，追究有关人员特别是领导干部的责任。

A.生态污染

B.大气污染

C.水污染

D.环境污染