My mind wasn't on what he was saying，so I'm afraid I ________ half of it.

A．was missing

B．had missed

C．will miss

D．missed

风机发现下列情况之一，立即向有关人员汇报：（）

A、烟气温度超上限时。

B、风机振动过大。

C、煤气监测探头报警，有煤气泄露。

D、烟气温度逼近上限时。

E、风机有振动。