A: This toothache is killing me.
B: If I am right, this is the third time you’ve had it this month.A: You are right. ().

A. It’s all right.

B. It’ll be gone.

C. I have no method.

D. I’m fed up with it.

在运行的进程信号量S上作P操作后，当S＜0时，进程将进入信号量的( )。

A．等待队列

B．就绪队列

C．后备队列

D．提交队列