用DHCP服务器对公司内部主机的IP地址进行管理。在DHCP客户机上执行“ipconfig/all”得到的部分信息如图(A)所示，该客户机在进行地址续约时捕获的其中1条报文及相关分析如图(B)所示。请分析图中的信息，补全图(B)中的内容。（）

It was very difficult to rescue the drowning boy in the sea. One moment the rescue workers ____him

but the next moment they _____.    [ ]

A. caught sight of; lost                

B. caught the sight of; lost his sight  

C. caught sight of; lost sight of him      

D. caught the sight of; lost their sight of him