Lucy. Someone is waiting ________ you at the gate of the school.[ ]

A. with          

B. in       

C. for        

D. to

PC机中，8250的基准工作时钟为1.8432MHz，当8250的通信波特率为4800时，写入8250除数寄存器的高位和低位的值分别为______H和______。