单项选择题
I want to talk over the report with you()sending it to Mr.Smith.
A.beforeB.afterC.thenD.later
单项选择题 And()she could speak again I began to talk.
单项选择题 关于web安全及其威胁防护技术的描述,不正确的是()。
单项选择题 TCP/IP模型中,()协议属于网络层的协议。