The manager was concerned to hear that two of his trusted workers _____.

A．are leaving

B．have left

C．were leaving

D．will leave

编辑一份简短的试验电文，发给本船接收，以达到和岸台进行信息传送试验的效果。同时检查接收到信息时在驾驶台的（），以下不满足的是：（）

A、声响报警

B、光电报警

C、声光报警